前言：
如今姐妹们对“js限制文本长度”大约比较注意，我们都想要了解一些“js限制文本长度”的相关知识。那么小编也在网络上汇集了一些对于“js限制文本长度””的相关内容，希望兄弟们能喜欢，朋友们快快来了解一下吧！前言
因为工作中经常用到这些方法，所有便把这些方法进行了总结。JavaScript1. type 类型判断
isString (o) { //是否字符串 return Object.prototype.toString.call(o).slice(8, -1) === 'String'}isNumber (o) { //是否数字 return Object.prototype.toString.call(o).slice(8, -1) === 'Number'}isBoolean (o) { //是否boolean return Object.prototype.toString.call(o).slice(8, -1) === 'Boolean'}isFunction (o) { //是否函数 return Object.prototype.toString.call(o).slice(8, -1) === 'Function'}isNull (o) { //是否为null return Object.prototype.toString.call(o).slice(8, -1) === 'Null'}isUndefined (o) { //是否undefined return Object.prototype.toString.call(o).slice(8, -1) === 'Undefined'}isObj (o) { //是否对象 return Object.prototype.toString.call(o).slice(8, -1) === 'Object'}isArray (o) { //是否数组 return Object.prototype.toString.call(o).slice(8, -1) === 'Array'}isDate (o) { //是否时间 return Object.prototype.toString.call(o).slice(8, -1) === 'Date'}isRegExp (o) { //是否正则 return Object.prototype.toString.call(o).slice(8, -1) === 'RegExp'}isError (o) { //是否错误对象 return Object.prototype.toString.call(o).slice(8, -1) === 'Error'}isSymbol (o) { //是否Symbol函数 return Object.prototype.toString.call(o).slice(8, -1) === 'Symbol'}isPromise (o) { //是否Promise对象 return Object.prototype.toString.call(o).slice(8, -1) === 'Promise'}isSet (o) { //是否Set对象 return Object.prototype.toString.call(o).slice(8, -1) === 'Set'}isFalse (o) { if (!o || o === 'null' || o === 'undefined' || o === 'false' || o === 'NaN') return true return false}isTrue (o) { return !this.isFalse(o)}isIos () { var u = navigator.userAgent; if (u.indexOf('Android') > -1 || u.indexOf('Linux') > -1) {//安卓手机 // return "Android"; return false } else if (u.indexOf('iPhone') > -1) {//苹果手机 // return "iPhone"; return true } else if (u.indexOf('iPad') > -1) {//iPad // return "iPad"; return false } else if (u.indexOf('Windows Phone') > -1) {//winphone手机 // return "Windows Phone"; return false }else{ return false }}isPC () { //是否为PC端 var userAgentInfo = navigator.userAgent; var Agents = ["Android", "iPhone", "SymbianOS", "Windows Phone", "iPad", "iPod"]; var flag = true; for (var v = 0; v < Agents.length; v++) { if (userAgentInfo.indexOf(Agents[v]) > 0) { flag = false; break; } } return flag;}browserType(){ var userAgent = navigator.userAgent; //取得浏览器的userAgent字符串 var isOpera = userAgent.indexOf("Opera") > -1; //判断是否Opera浏览器 var isIE = userAgent.indexOf("compatible") > -1 && userAgent.indexOf("MSIE") > -1 && !isOpera; //判断是否IE浏览器 var isIE11 = userAgent.indexOf('Trident') > -1 && userAgent.indexOf("rv:11.0") > -1; var isEdge = userAgent.indexOf("Edge") > -1 && !isIE; //判断是否IE的Edge浏览器 var isFF = userAgent.indexOf("Firefox") > -1; //判断是否Firefox浏览器 var isSafari = userAgent.indexOf("Safari") > -1 && userAgent.indexOf("Chrome") == -1; //判断是否Safari浏览器 var isChrome = userAgent.indexOf("Chrome") > -1 && userAgent.indexOf("Safari") > -1; //判断Chrome浏览器 if (isIE) { var reIE = new RegExp("MSIE (\\d+\\.\\d+);"); reIE.test(userAgent); var fIEVersion = parseFloat(RegExp["$1"]); if(fIEVersion == 7) return "IE7" else if(fIEVersion == 8) return "IE8"; else if(fIEVersion == 9) return "IE9"; else if(fIEVersion == 10) return "IE10"; else return "IE7以下"//IE版本过低 } if (isIE11) return 'IE11'; if (isEdge) return "Edge"; if (isFF) return "FF"; if (isOpera) return "Opera"; if (isSafari) return "Safari"; if (isChrome) return "Chrome";}checkStr (str, type) { switch (type) { case 'phone': //手机号码 return /^1[3|4|5|6|7|8|9][0-9]{9}$/.test(str); case 'tel': //座机 return /^(0\d{2,3}-\d{7,8})(-\d{1,4})?$/.test(str); case 'card': //身份证 return /(^\d{15}$)|(^\d{18}$)|(^\d{17}(\d|X|x)$)/.test(str); case 'pwd': //密码以字母开头，长度在6~18之间，只能包含字母、数字和下划线 return /^[a-zA-Z]\w{5,17}$/.test(str) case 'postal': //邮政编码 return /[1-9]\d{5}(?!\d)/.test(str); case 'QQ': //QQ号 return /^[1-9][0-9]{4,9}$/.test(str); case 'email': //邮箱 return /^[\w-]+(\.[\w-]+)*@[\w-]+(\.[\w-]+)+$/.test(str); case 'money': //金额(小数点2位) return /^\d*(?:\.\d{0,2})?$/.test(str); case 'URL': //网址 return /(http|ftp|https):\/\/[\w\-_]+(\.[\w\-_]+)+([\w\-\.,@?^=%&:/~\+#]*[\w\-\@?^=%&/~\+#])?/.test(str) case 'IP': //IP return /((?:(?:25[0-5]|2[0-4]\\d|[01]?\\d?\\d)\\.){3}(?:25[0-5]|2[0-4]\\d|[01]?\\d?\\d))/.test(str); case 'date': //日期时间 return /^(\d{4})\-(\d{2})\-(\d{2}) (\d{2})(?:\:\d{2}|:(\d{2}):(\d{2}))$/.test(str) || /^(\d{4})\-(\d{2})\-(\d{2})$/.test(str) case 'number': //数字 return /^[0-9]$/.test(str); case 'english': //英文 return /^[a-zA-Z]+$/.test(str); case 'chinese': //中文 return /^[\u4E00-\u9FA5]+$/.test(str); case 'lower': //小写 return /^[a-z]+$/.test(str); case 'upper': //大写 return /^[A-Z]+$/.test(str); case 'HTML': //HTML标记 return /<("[^"]*"|'[^']*'|[^'">])*>/.test(str); default: return true; } // 严格的身份证校验 isCardID(sId) { if (!/(^\d{15}$)|(^\d{17}(\d|X|x)$)/.test(sId)) { alert('你输入的身份证长度或格式错误') return false } //身份证城市 var aCity={11:"北京",12:"天津",13:"河北",14:"山西",15:"内蒙古",21:"辽宁",22:"吉林",23:"黑龙江",31:"上海",32:"江苏",33:"浙江",34:"安徽",35:"福建",36:"江西",37:"山东",41:"河南",42:"湖北",43:"湖南",44:"广东",45:"广西",46:"海南",50:"重庆",51:"四川",52:"贵州",53:"云南",54:"西藏",61:"陕西",62:"甘肃",63:"青海",64:"宁夏",65:"新疆",71:"台湾",81:"香港",82:"澳门",91:"国外"}; if(!aCity[parseInt(sId.substr(0,2))]) { alert('你的身份证地区非法') return false } // 出生日期验证 var sBirthday=(sId.substr(6,4)+"-"+Number(sId.substr(10,2))+"-"+Number(sId.substr(12,2))).replace(/-/g,"/"), d = new Date(sBirthday) if(sBirthday != (d.getFullYear()+"/"+ (d.getMonth()+1) + "/" + d.getDate())) { alert('身份证上的出生日期非法') return false } // 身份证号码校验 var sum = 0, weights = [7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2], codes = "10X98765432" for (var i = 0; i < sId.length - 1; i++) { sum += sId[i] * weights[i]; } var last = codes[sum % 11]; //计算出来的最后一位身份证号码 if (sId[sId.length-1] != last) { alert('你输入的身份证号非法') return false } return true }}2. Date/** * 格式化时间 * * @param {time} 时间 * @param {cFormat} 格式 * @return {String} 字符串 * * @example formatTime('2018-1-29', '{y}/{m}/{d} {h}:{i}:{s}') // -> 2018/01/29 00:00:00 */formatTime(time, cFormat) { if (arguments.length === 0) return null if ((time + '').length === 10) { time = +time * 1000 } var format = cFormat || '{y}-{m}-{d} {h}:{i}:{s}', date if (typeof time === 'object') { date = time } else { date = new Date(time) } var formatObj = { y: date.getFullYear(), m: date.getMonth() + 1, d: date.getDate(), h: date.getHours(), i: date.getMinutes(), s: date.getSeconds(), a: date.getDay() } var time_str = format.replace(/{(y|m|d|h|i|s|a)+}/g, (result, key) => { var value = formatObj[key] if (key === 'a') return ['一', '二', '三', '四', '五', '六', '日'][value - 1] if (result.length > 0 && value < 10) { value = '0' + value } return value || 0 }) return time_str}/** * 返回指定长度的月份集合 * * @param {time} 时间 * @param {len} 长度 * @param {direction} 方向： 1: 前几个月; 2: 后几个月; 3:前后几个月 默认 3 * @return {Array} 数组 * * @example getMonths('2018-1-29', 6, 1) // -> ["2018-1", "2017-12", "2017-11", "2017-10", "2017-9", "2017-8", "2017-7"] */getMonths(time, len, direction) { var mm = new Date(time).getMonth(), yy = new Date(time).getFullYear(), direction = isNaN(direction) ? 3 : direction, index = mm; var cutMonth = function(index) { if ( index <= len && index >= -len) { return direction === 1 ? formatPre(index).concat(cutMonth(++index)): direction === 2 ? formatNext(index).concat(cutMonth(++index)):formatCurr(index).concat(cutMonth(++index)) } return [] } var formatNext = function(i) { var y = Math.floor(i/12), m = i%12 return [yy+y + '-' + (m+1)] } var formatPre = function(i) { var y = Math.ceil(i/12), m = i%12 m = m===0 ? 12 : m return [yy-y + '-' + (13 - m)] } var formatCurr = function(i) { var y = Math.floor(i/12), yNext = Math.ceil(i/12), m = i%12, mNext = m===0 ? 12 : m return [yy-yNext + '-' + (13 - mNext),yy+y + '-' + (m+1)] } // 数组去重 var unique = function(arr) { if ( Array.hasOwnProperty('from') ) { return Array.from(new Set(arr)); }else{ var n = {},r=[]; for(var i = 0; i < arr.length; i++){ if (!n[arr[i]]){ n[arr[i]] = true; r.push(arr[i]); } } return r; } } return direction !== 3 ? cutMonth(index) : unique(cutMonth(index).sort(function(t1, t2){ return new Date(t1).getTime() - new Date(t2).getTime() }))}/** * 返回指定长度的天数集合 * * @param {time} 时间 * @param {len} 长度 * @param {direction} 方向： 1: 前几天; 2: 后几天; 3:前后几天 默认 3 * @return {Array} 数组 * * @example date.getDays('2018-1-29', 6) // -> ["2018-1-26", "2018-1-27", "2018-1-28", "2018-1-29", "2018-1-30", "2018-1-31", "2018-2-1"] */getDays(time, len, diretion) { var tt = new Date(time) var getDay = function(day) { var t = new Date(time) t.setDate(t.getDate() + day) var m = t.getMonth()+1 return t.getFullYear()+'-'+m+'-'+t.getDate() } var arr = [] if (diretion === 1) { for (var i = 1; i <= len; i++) { arr.unshift(getDay(-i)) } }else if(diretion === 2) { for (var i = 1; i <= len; i++) { arr.push(getDay(i)) } }else { for (var i = 1; i <= len; i++) { arr.unshift(getDay(-i)) } arr.push(tt.getFullYear()+'-'+(tt.getMonth()+1)+'-'+tt.getDate()) for (var i = 1; i <= len; i++) { arr.push(getDay(i)) } } return diretion === 1 ? arr.concat([tt.getFullYear()+'-'+(tt.getMonth()+1)+'-'+tt.getDate()]) : diretion === 2 ? [tt.getFullYear()+'-'+(tt.getMonth()+1)+'-'+tt.getDate()].concat(arr) : arr}/** * @param {s} 秒数 * @return {String} 字符串 * * @example formatHMS(3610) // -> 1h0m10s */formatHMS (s) { var str = '' if (s > 3600) { str = Math.floor(s/3600)+'h'+Math.floor(s%3600/60)+'m'+s%60+'s' }else if(s > 60) { str = Math.floor(s/60)+'m'+s%60+'s' }else{ str = s%60+'s' } return str}/*获取某月有多少天*/getMonthOfDay (time) { var date = new Date(time) var year = date.getFullYear() var mouth = date.getMonth() + 1 var days //当月份为二月时，根据闰年还是非闰年判断天数 if (mouth == 2) { days = (year%4==0 && year%100==0 && year%400==0) || (year%4==0 && year%100!=0) ? 28 : 29 } else if (mouth == 1 || mouth == 3 || mouth == 5 || mouth == 7 || mouth == 8 || mouth == 10 || mouth == 12) { //月份为：1,3,5,7,8,10,12 时，为大月.则天数为31； days = 31 } else { //其他月份，天数为：30. days = 30 } return days}/*获取某年有多少天*/getYearOfDay (time) { var firstDayYear = this.getFirstDayOfYear(time); var lastDayYear = this.getLastDayOfYear(time); var numSecond = (new Date(lastDayYear).getTime() - new Date(firstDayYear).getTime())/1000; return Math.ceil(numSecond/(24*3600));}/*获取某年的第一天*/getFirstDayOfYear (time) { var year = new Date(time).getFullYear(); return year + "-01-01 00:00:00";}/*获取某年最后一天*/getLastDayOfYear (time) { var year = new Date(time).getFullYear(); var dateString = year + "-12-01 00:00:00"; var endDay = this.getMonthOfDay(dateString); return year + "-12-" + endDay + " 23:59:59";}/*获取某个日期是当年中的第几天*/getDayOfYear (time) { var firstDayYear = this.getFirstDayOfYear(time); var numSecond = (new Date(time).getTime() - new Date(firstDayYear).getTime())/1000; return Math.ceil(numSecond/(24*3600));}/*获取某个日期在这一年的第几周*/getDayOfYearWeek (time) { var numdays = this.getDayOfYear(time); return Math.ceil(numdays / 7);}3. Array/*判断一个元素是否在数组中*/contains (arr, val) { return arr.indexOf(val) != -1 ? true : false;}/** * @param {arr} 数组 * @param {fn} 回调函数 * @return {undefined} */each (arr, fn) { fn = fn || Function; var a = []; var args = Array.prototype.slice.call(arguments, 1); for(var i = 0; i < arr.length; i++) { var res = fn.apply(arr, [arr[i], i].concat(args)); if(res != null) a.push(res); }}/** * @param {arr} 数组 * @param {fn} 回调函数 * @param {thisObj} this指向 * @return {Array} */map (arr, fn, thisObj) { var scope = thisObj || window; var a = []; for(var i = 0, j = arr.length; i < j; ++i) { var res = fn.call(scope, arr[i], i, this); if(res != null) a.push(res); } return a;}/** * @param {arr} 数组 * @param {type} 1：从小到大 2：从大到小 3：随机 * @return {Array} */sort (arr, type = 1) { return arr.sort( (a, b) => { switch(type) { case 1: return a - b; case 2: return b - a; case 3: return Math.random() - 0.5; default: return arr; } })}/*去重*/unique (arr) { if ( Array.hasOwnProperty('from') ) { return Array.from(new Set(arr)); }else{ var n = {},r=[]; for(var i = 0; i < arr.length; i++){ if (!n[arr[i]]){ n[arr[i]] = true; r.push(arr[i]); } } return r; } // 注：上面 else 里面的排重并不能区分 2 和 '2'，但能减少用indexOf带来的性能,暂时没找到替代的方法。。。 /* 正确排重 if ( Array.hasOwnProperty('from') ) { return Array.from(new Set(arr)) }else{ var r = [], NaNBol = true for(var i=0; i < arr.length; i++) { if (arr[i] !== arr[i]) { if (NaNBol && r.indexOf(arr[i]) === -1) { r.push(arr[i]) NaNBol = false } }else{ if(r.indexOf(arr[i]) === -1) r.push(arr[i]) } } return r } */}/*求两个集合的并集*/union (a, b) { var newArr = a.concat(b); return this.unique(newArr);}/*求两个集合的交集*/intersect (a, b) { var _this = this; a = this.unique(a); return this.map(a, function(o) { return _this.contains(b, o) ? o : null; });}/*删除其中一个元素*/remove (arr, ele) { var index = arr.indexOf(ele); if(index > -1) { arr.splice(index, 1); } return arr;}/*将类数组转换为数组的方法*/formArray (ary) { var arr = []; if(Array.isArray(ary)) { arr = ary; } else { arr = Array.prototype.slice.call(ary); }; return arr;}/*最大值*/max (arr) { return Math.max.apply(null, arr);}/*最小值*/min (arr) { return Math.min.apply(null, arr);}/*求和*/sum (arr) { return arr.reduce( (pre, cur) => { return pre + cur })}/*平均值*/average (arr) { return this.sum(arr)/arr.length}4. String 字符串操作/** * 去除空格 * @param {str} * @param {type} * type: 1-所有空格 2-前后空格 3-前空格 4-后空格 * @return {String} */trim (str, type) { type = type || 1 switch (type) { case 1: return str.replace(/\s+/g, ""); case 2: return str.replace(/(^\s*)|(\s*$)/g, ""); case 3: return str.replace(/(^\s*)/g, ""); case 4: return str.replace(/(\s*$)/g, ""); default: return str; }}/** * @param {str} * @param {type} * type: 1:首字母大写 2：首页母小写 3：大小写转换 4：全部大写 5：全部小写 * @return {String} */changeCase (str, type) { type = type || 4 switch (type) { case 1: return str.replace(/\b\w+\b/g, function (word) { return word.substring(0, 1).toUpperCase() + word.substring(1).toLowerCase(); }); case 2: return str.replace(/\b\w+\b/g, function (word) { return word.substring(0, 1).toLowerCase() + word.substring(1).toUpperCase(); }); case 3: return str.split('').map( function(word){ if (/[a-z]/.test(word)) { return word.toUpperCase(); }else{ return word.toLowerCase() } }).join('') case 4: return str.toUpperCase(); case 5: return str.toLowerCase(); default: return str; }}/* 检测密码强度*/checkPwd (str) { var Lv = 0; if (str.length < 6) { return Lv } if (/[0-9]/.test(str)) { Lv++ } if (/[a-z]/.test(str)) { Lv++ } if (/[A-Z]/.test(str)) { Lv++ } if (/[\.|-|_]/.test(str)) { Lv++ } return Lv;}/*过滤html代码(把<>转换)*/filterTag (str) { str = str.replace(/&/ig, "&"); str = str.replace(/</ig, "<"); str = str.replace(/>/ig, ">"); str = str.replace(" ", " "); return str;}5. Number/*随机数范围*/random (min, max) { if (arguments.length === 2) { return Math.floor(min + Math.random() * ( (max+1) - min )) }else{ return null; } }/*将阿拉伯数字翻译成中文的大写数字*/numberToChinese (num) { var AA = new Array("零", "一", "二", "三", "四", "五", "六", "七", "八", "九", "十"); var BB = new Array("", "十", "百", "仟", "萬", "億", "点", ""); var a = ("" + num).replace(/(^0*)/g, "").split("."), k = 0, re = ""; for(var i = a[0].length - 1; i >= 0; i--) { switch(k) { case 0: re = BB[7] + re; break; case 4: if(!new RegExp("0{4}//d{" + (a[0].length - i - 1) + "}$") .test(a[0])) re = BB[4] + re; break; case 8: re = BB[5] + re; BB[7] = BB[5]; k = 0; break; } if(k % 4 == 2 && a[0].charAt(i + 2) != 0 && a[0].charAt(i + 1) == 0) re = AA[0] + re; if(a[0].charAt(i) != 0) re = AA[a[0].charAt(i)] + BB[k % 4] + re; k++; } if(a.length > 1) // 加上小数部分(如果有小数部分) { re += BB[6]; for(var i = 0; i < a[1].length; i++) re += AA[a[1].charAt(i)]; } if(re == '一十') re = "十"; if(re.match(/^一/) && re.length == 3) re = re.replace("一", ""); return re;}/*将数字转换为大写金额*/changeToChinese (Num) { //判断如果传递进来的不是字符的话转换为字符 if(typeof Num == "number") { Num = new String(Num); }; Num = Num.replace(/,/g, "") //替换tomoney()中的“,” Num = Num.replace(/ /g, "") //替换tomoney()中的空格 Num = Num.replace(/￥/g, "") //替换掉可能出现的￥字符 if(isNaN(Num)) { //验证输入的字符是否为数字 //alert("请检查小写金额是否正确"); return ""; }; //字符处理完毕后开始转换，采用前后两部分分别转换 var part = String(Num).split("."); var newchar = ""; //小数点前进行转化 for(var i = part[0].length - 1; i >= 0; i--) { if(part[0].length > 10) { return ""; //若数量超过拾亿单位，提示 } var tmpnewchar = "" var perchar = part[0].charAt(i); switch(perchar) { case "0": tmpnewchar = "零" + tmpnewchar; break; case "1": tmpnewchar = "壹" + tmpnewchar; break; case "2": tmpnewchar = "贰" + tmpnewchar; break; case "3": tmpnewchar = "叁" + tmpnewchar; break; case "4": tmpnewchar = "肆" + tmpnewchar; break; case "5": tmpnewchar = "伍" + tmpnewchar; break; case "6": tmpnewchar = "陆" + tmpnewchar; break; case "7": tmpnewchar = "柒" + tmpnewchar; break; case "8": tmpnewchar = "捌" + tmpnewchar; break; case "9": tmpnewchar = "玖" + tmpnewchar; break; } switch(part[0].length - i - 1) { case 0: tmpnewchar = tmpnewchar + "元"; break; case 1: if(perchar != 0) tmpnewchar = tmpnewchar + "拾"; break; case 2: if(perchar != 0) tmpnewchar = tmpnewchar + "佰"; break; case 3: if(perchar != 0) tmpnewchar = tmpnewchar + "仟"; break; case 4: tmpnewchar = tmpnewchar + "万"; break; case 5: if(perchar != 0) tmpnewchar = tmpnewchar + "拾"; break; case 6: if(perchar != 0) tmpnewchar = tmpnewchar + "佰"; break; case 7: if(perchar != 0) tmpnewchar = tmpnewchar + "仟"; break; case 8: tmpnewchar = tmpnewchar + "亿"; break; case 9: tmpnewchar = tmpnewchar + "拾"; break; } var newchar = tmpnewchar + newchar; } //小数点之后进行转化 if(Num.indexOf(".") != -1) { if(part[1].length > 2) { // alert("小数点之后只能保留两位,系统将自动截断"); part[1] = part[1].substr(0, 2) } for(i = 0; i < part[1].length; i++) { tmpnewchar = "" perchar = part[1].charAt(i) switch(perchar) { case "0": tmpnewchar = "零" + tmpnewchar; break; case "1": tmpnewchar = "壹" + tmpnewchar; break; case "2": tmpnewchar = "贰" + tmpnewchar; break; case "3": tmpnewchar = "叁" + tmpnewchar; break; case "4": tmpnewchar = "肆" + tmpnewchar; break; case "5": tmpnewchar = "伍" + tmpnewchar; break; case "6": tmpnewchar = "陆" + tmpnewchar; break; case "7": tmpnewchar = "柒" + tmpnewchar; break; case "8": tmpnewchar = "捌" + tmpnewchar; break; case "9": tmpnewchar = "玖" + tmpnewchar; break; } if(i == 0) tmpnewchar = tmpnewchar + "角"; if(i == 1) tmpnewchar = tmpnewchar + "分"; newchar = newchar + tmpnewchar; } } //替换所有无用汉字 while(newchar.search("零零") != -1) newchar = newchar.replace("零零", "零"); newchar = newchar.replace("零亿", "亿"); newchar = newchar.replace("亿万", "亿"); newchar = newchar.replace("零万", "万"); newchar = newchar.replace("零元", "元"); newchar = newchar.replace("零角", ""); newchar = newchar.replace("零分", ""); if(newchar.charAt(newchar.length - 1) == "元") { newchar = newchar + "整" } return newchar; }6. Http/** * @param {setting} */ajax(setting){ //设置参数的初始值 var opts={ method: (setting.method || "GET").toUpperCase(), //请求方式 url: setting.url || "", // 请求地址 async: setting.async || true, // 是否异步 dataType: setting.dataType || "json", // 解析方式 data: setting.data || "", // 参数 success: setting.success || function(){}, // 请求成功回调 error: setting.error || function(){} // 请求失败回调 } // 参数格式化 function params_format (obj) { var str = '' for (var i in obj) { str += i + '=' + obj[i] + '&' } return str.split('').slice(0, -1).join('') } // 创建ajax对象 var xhr=new XMLHttpRequest(); // 连接服务器open(方法GET/POST，请求地址， 异步传输) if(opts.method == 'GET'){ xhr.open(opts.method, opts.url + "?" + params_format(opts.data), opts.async); xhr.send(); }else{ xhr.open(opts.method, opts.url, opts.async); xhr.setRequestHeader("Content-Type","application/x-www-form-urlencoded"); xhr.send(opts.data); } /* ** 每当readyState改变时，就会触发onreadystatechange事件 ** readyState属性存储有XMLHttpRequest的状态信息 ** 0 ：请求未初始化 ** 1 ：服务器连接已建立 ** 2 ：请求已接受 ** 3 : 请求处理中 ** 4 ：请求已完成，且相应就绪 */ xhr.onreadystatechange = function() { if (xhr.readyState === 4 && (xhr.status === 200 || xhr.status === 304)) { switch(opts.dataType){ case "json": var json = JSON.parse(xhr.responseText); opts.success(json); break; case "xml": opts.success(xhr.responseXML); break; default: opts.success(xhr.responseText); break; } } } xhr.onerror = function(err) { opts.error(err); }}/** * @param {url} * @param {setting} * @return {Promise} */fetch(url, setting) { //设置参数的初始值 let opts={ method: (setting.method || 'GET').toUpperCase(), //请求方式 headers : setting.headers || {}, // 请求头设置 credentials : setting.credentials || true, // 设置cookie是否一起发送 body: setting.body || {}, mode : setting.mode || 'no-cors', // 可以设置 cors, no-cors, same-origin redirect : setting.redirect || 'follow', // follow, error, manual cache : setting.cache || 'default' // 设置 cache 模式 (default, reload, no-cache) } let dataType = setting.dataType || "json", // 解析方式 data = setting.data || "" // 参数 // 参数格式化 function params_format (obj) { var str = '' for (var i in obj) { str += `${i}=${obj[i]}&` } return str.split('').slice(0, -1).join('') } if (opts.method === 'GET') { url = url + (data?`?${params_format(data)}`:'') }else{ setting.body = data || {} } return new Promise( (resolve, reject) => { fetch(url, opts).then( async res => { let data = dataType === 'text' ? await res.text() : dataType === 'blob' ? await res.blob() : await res.json() resolve(data) }).catch( e => { reject(e) }) }) }7. DOM$ (selector){ var type = selector.substring(0, 1); if (type === '#') { if (document.querySelecotor) return document.querySelector(selector) return document.getElementById(selector.substring(1)) }else if (type === '.') { if (document.querySelecotorAll) return document.querySelectorAll(selector) return document.getElementsByClassName(selector.substring(1)) }else{ return document['querySelectorAll' ? 'querySelectorAll':'getElementsByTagName'](selector) }} /*检测类名*/hasClass (ele, name) { return ele.className.match(new RegExp('(\\s|^)' + name + '(\\s|$)'));}/*添加类名*/addClass (ele, name) { if (!this.hasClass(ele, name)) ele.className += " " + name;}/*删除类名*/removeClass (ele, name) { if (this.hasClass(ele, name)) { var reg = new RegExp('(\\s|^)' + name + '(\\s|$)'); ele.className = ele.className.replace(reg, ''); }}/*替换类名*/replaceClass (ele, newName, oldName) { this.removeClass(ele, oldName); this.addClass(ele, newName);}/*获取兄弟节点*/siblings (ele) { console.log(ele.parentNode) var chid = ele.parentNode.children,eleMatch = []; for(var i = 0, len = chid.length; i < len; i ++){ if(chid[i] != ele){ eleMatch.push(chid[i]); } } return eleMatch;}/*获取行间样式属性*/getByStyle (obj,name){ if(obj.currentStyle){ return obj.currentStyle[name]; }else{ return getComputedStyle(obj,false)[name]; }}8. Storage 储存操作class StorageFn { constructor () { this.ls = window.localStorage; this.ss = window.sessionStorage; } /*-----------------cookie---------------------*/ /*设置cookie*/ setCookie (name, value, day) { var setting = arguments[0]; if (Object.prototype.toString.call(setting).slice(8, -1) === 'Object'){ for (var i in setting) { var oDate = new Date(); oDate.setDate(oDate.getDate() + day); document.cookie = i + '=' + setting[i] + ';expires=' + oDate; } }else{ var oDate = new Date(); oDate.setDate(oDate.getDate() + day); document.cookie = name + '=' + value + ';expires=' + oDate; } } /*获取cookie*/ getCookie (name) { var arr = document.cookie.split('; '); for (var i = 0; i < arr.length; i++) { var arr2 = arr[i].split('='); if (arr2[0] == name) { return arr2[1]; } } return ''; } /*删除cookie*/ removeCookie (name) { this.setCookie(name, 1, -1); } /*-----------------localStorage---------------------*/ /*设置localStorage*/ setLocal(key, val) { var setting = arguments[0]; if (Object.prototype.toString.call(setting).slice(8, -1) === 'Object'){ for(var i in setting){ this.ls.setItem(i, JSON.stringify(setting[i])) } }else{ this.ls.setItem(key, JSON.stringify(val)) } } /*获取localStorage*/ getLocal(key) { if (key) return JSON.parse(this.ls.getItem(key)) return null; } /*移除localStorage*/ removeLocal(key) { this.ls.removeItem(key) } /*移除所有localStorage*/ clearLocal() { this.ls.clear() } /*-----------------sessionStorage---------------------*/ /*设置sessionStorage*/ setSession(key, val) { var setting = arguments[0]; if (Object.prototype.toString.call(setting).slice(8, -1) === 'Object'){ for(var i in setting){ this.ss.setItem(i, JSON.stringify(setting[i])) } }else{ this.ss.setItem(key, JSON.stringify(val)) } } /*获取sessionStorage*/ getSession(key) { if (key) return JSON.parse(this.ss.getItem(key)) return null; } /*移除sessionStorage*/ removeSession(key) { this.ss.removeItem(key) } /*移除所有sessionStorage*/ clearSession() { this.ss.clear() } }9. Other 其它操作/*获取网址参数*/getURL(name){ var reg = new RegExp("(^|&)"+ name +"=([^&]*)(&|$)"); var r = decodeURI(window.location.search).substr(1).match(reg); if(r!=null) return r[2]; return null;}/*获取全部url参数,并转换成json对象*/getUrlAllParams (url) { var url = url ? url : window.location.href; var _pa = url.substring(url.indexOf('?') + 1), _arrS = _pa.split('&'), _rs = {}; for (var i = 0, _len = _arrS.length; i < _len; i++) { var pos = _arrS[i].indexOf('='); if (pos == -1) { continue; } var name = _arrS[i].substring(0, pos), value = window.decodeURIComponent(_arrS[i].substring(pos + 1)); _rs[name] = value; } return _rs;}/*删除url指定参数，返回url*/delParamsUrl(url, name){ var baseUrl = url.split('?')[0] + '?'; var query = url.split('?')[1]; if (query.indexOf(name)>-1) { var obj = {} var arr = query.split("&"); for (var i = 0; i < arr.length; i++) { arr[i] = arr[i].split("="); obj[arr[i][0]] = arr[i][1]; }; delete obj[name]; var url = baseUrl + JSON.stringify(obj).replace(/[\"\{\}]/g,"").replace(/\:/g,"=").replace(/\,/g,"&"); return url }else{ return url; }}/*获取十六进制随机颜色*/getRandomColor () { return '#' + (function(h) { return new Array(7 - h.length).join("0") + h; })((Math.random() * 0x1000000 << 0).toString(16));}/*图片加载*/imgLoadAll(arr,callback){ var arrImg = []; for (var i = 0; i < arr.length; i++) { var img = new Image(); img.src = arr[i]; img.onload = function(){ arrImg.push(this); if (arrImg.length == arr.length) { callback && callback(); } } }}/*音频加载*/loadAudio(src, callback) { var audio = new Audio(src); audio.onloadedmetadata = callback; audio.src = src;}/*DOM转字符串*/domToStirng(htmlDOM){ var div= document.createElement("div"); div.appendChild(htmlDOM); return div.innerHTML}/*字符串转DOM*/stringToDom(htmlString){ var div= document.createElement("div"); div.innerHTML=htmlString; return div.children[0];}/** * 光标所在位置插入字符，并设置光标位置 * * @param {dom} 输入框 * @param {val} 插入的值 * @param {posLen} 光标位置处在 插入的值的哪个位置 */setCursorPosition (dom,val,posLen) { var cursorPosition = 0; if(dom.selectionStart){ cursorPosition = dom.selectionStart; } this.insertAtCursor(dom,val); dom.focus(); console.log(posLen) dom.setSelectionRange(dom.value.length,cursorPosition + (posLen || val.length));}/*光标所在位置插入字符*/insertAtCursor(dom, val) { if (document.selection){ dom.focus(); sel = document.selection.createRange(); sel.text = val; sel.select(); }else if (dom.selectionStart || dom.selectionStart == '0'){ let startPos = dom.selectionStart; let endPos = dom.selectionEnd; let restoreTop = dom.scrollTop; dom.value = dom.value.substring(0, startPos) + val + dom.value.substring(endPos, dom.value.length); if (restoreTop > 0){ dom.scrollTop = restoreTop; } dom.focus(); dom.selectionStart = startPos + val.length; dom.selectionEnd = startPos + val.length; } else { dom.value += val; dom.focus(); }}CSS1. pc-reset PC样式初始化/* normalize.css */html { line-height: 1.15; /* 1 */ -ms-text-size-adjust: 100%; /* 2 */ -webkit-text-size-adjust: 100%; /* 2 */}body { margin: 0;}article,aside,footer,header,nav,section { display: block;}h1 { font-size: 2em; margin: 0.67em 0;}figcaption,figure,main { /* 1 */ display: block;}figure { margin: 1em 40px;}hr { box-sizing: content-box; /* 1 */ height: 0; /* 1 */ overflow: visible; /* 2 */}pre { font-family: monospace, monospace; /* 1 */ font-size: 1em; /* 2 */}a { background-color: transparent; /* 1 */ -webkit-text-decoration-skip: objects; /* 2 */}abbr[title] { border-bottom: none; /* 1 */ text-decoration: underline; /* 2 */ text-decoration: underline dotted; /* 2 */}b,strong { font-weight: inherit;}b,strong { font-weight: bolder;}code,kbd,samp { font-family: monospace, monospace; /* 1 */ font-size: 1em; /* 2 */}dfn { font-style: italic;}mark { background-color: #ff0; color: #000;}small { font-size: 80%;}sub,sup { font-size: 75%; line-height: 0; position: relative; vertical-align: baseline;}sub { bottom: -0.25em;}sup { top: -0.5em;}audio,video { display: inline-block;}audio:not([controls]) { display: none; height: 0;}img { border-style: none;}svg:not(:root) { overflow: hidden;}button,input,optgroup,select,textarea { font-family: sans-serif; /* 1 */ font-size: 100%; /* 1 */ line-height: 1.15; /* 1 */ margin: 0; /* 2 */}button,input { /* 1 */ overflow: visible;}button,select { /* 1 */ text-transform: none;}button,html [type="button"],/* 1 */[type="reset"],[type="submit"] { -webkit-appearance: button; /* 2 */}button::-moz-focus-inner,[type="button"]::-moz-focus-inner,[type="reset"]::-moz-focus-inner,[type="submit"]::-moz-focus-inner { border-style: none; padding: 0;}button:-moz-focusring,[type="button"]:-moz-focusring,[type="reset"]:-moz-focusring,[type="submit"]:-moz-focusring { outline: 1px dotted ButtonText;}fieldset { padding: 0.35em 0.75em 0.625em;}legend { box-sizing: border-box; /* 1 */ color: inherit; /* 2 */ display: table; /* 1 */ max-width: 100%; /* 1 */ padding: 0; /* 3 */ white-space: normal; /* 1 */}progress { display: inline-block; /* 1 */ vertical-align: baseline; /* 2 */}textarea { overflow: auto;}[type="checkbox"],[type="radio"] { box-sizing: border-box; /* 1 */ padding: 0; /* 2 */}[type="number"]::-webkit-inner-spin-button,[type="number"]::-webkit-outer-spin-button { height: auto;}[type="search"] { -webkit-appearance: textfield; /* 1 */ outline-offset: -2px; /* 2 */}[type="search"]::-webkit-search-cancel-button,[type="search"]::-webkit-search-decoration { -webkit-appearance: none;} ::-webkit-file-upload-button { -webkit-appearance: button; /* 1 */ font: inherit; /* 2 */}details,/* 1 */menu { display: block;}summary { display: list-item;}canvas { display: inline-block;}template { display: none;}[hidden] { display: none;}/* reset */html,body,h1,h2,h3,h4,h5,h6,div,dl,dt,dd,ul,ol,li,p,blockquote,pre,hr,figure,table,caption,th,td,form,fieldset,legend,input,button,textarea,menu { margin: 0; padding: 0; box-sizing: border-box;}2. Phone-reset/* normalize.css */html { line-height: 1.15; /* 1 */ -ms-text-size-adjust: 100%; /* 2 */ -webkit-text-size-adjust: 100%; /* 2 */}body { margin: 0;}article,aside,footer,header,nav,section { display: block;}h1 { font-size: 2em; margin: 0.67em 0;}figcaption,figure,main { /* 1 */ display: block;}figure { margin: 1em 40px;}hr { box-sizing: content-box; /* 1 */ height: 0; /* 1 */ overflow: visible; /* 2 */}pre { font-family: monospace, monospace; /* 1 */ font-size: 1em; /* 2 */}a { background-color: transparent; /* 1 */ -webkit-text-decoration-skip: objects; /* 2 */}abbr[title] { border-bottom: none; /* 1 */ text-decoration: underline; /* 2 */ text-decoration: underline dotted; /* 2 */}b,strong { font-weight: inherit;}b,strong { font-weight: bolder;}code,kbd,samp { font-family: monospace, monospace; /* 1 */ font-size: 1em; /* 2 */}dfn { font-style: italic;}mark { background-color: #ff0; color: #000;}small { font-size: 80%;}sub,sup { font-size: 75%; line-height: 0; position: relative; vertical-align: baseline;}sub { bottom: -0.25em;}sup { top: -0.5em;}audio,video { display: inline-block;}audio:not([controls]) { display: none; height: 0;}img { border-style: none;}svg:not(:root) { overflow: hidden;}button,input,optgroup,select,textarea { font-family: sans-serif; /* 1 */ font-size: 100%; /* 1 */ line-height: 1.15; /* 1 */ margin: 0; /* 2 */}button,input { /* 1 */ overflow: visible;}button,select { /* 1 */ text-transform: none;}button,html [type="button"],/* 1 */[type="reset"],[type="submit"] { -webkit-appearance: button; /* 2 */}button::-moz-focus-inner,[type="button"]::-moz-focus-inner,[type="reset"]::-moz-focus-inner,[type="submit"]::-moz-focus-inner { border-style: none; padding: 0;}button:-moz-focusring,[type="button"]:-moz-focusring,[type="reset"]:-moz-focusring,[type="submit"]:-moz-focusring { outline: 1px dotted ButtonText;}fieldset { padding: 0.35em 0.75em 0.625em;}legend { box-sizing: border-box; /* 1 */ color: inherit; /* 2 */ display: table; /* 1 */ max-width: 100%; /* 1 */ padding: 0; /* 3 */ white-space: normal; /* 1 */}progress { display: inline-block; /* 1 */ vertical-align: baseline; /* 2 */}textarea { overflow: auto;}[type="checkbox"],[type="radio"] { box-sizing: border-box; /* 1 */ padding: 0; /* 2 */}[type="number"]::-webkit-inner-spin-button,[type="number"]::-webkit-outer-spin-button { height: auto;}[type="search"] { -webkit-appearance: textfield; /* 1 */ outline-offset: -2px; /* 2 */}[type="search"]::-webkit-search-cancel-button,[type="search"]::-webkit-search-decoration { -webkit-appearance: none;} ::-webkit-file-upload-button { -webkit-appearance: button; /* 1 */ font: inherit; /* 2 */}details,/* 1 */menu { display: block;}summary { display: list-item;}canvas { display: inline-block;}template { display: none;}[hidden] { display: none;}/* reset */html,body,h1,h2,h3,h4,h5,h6,div,dl,dt,dd,ul,ol,li,p,blockquote,pre,hr,figure,table,caption,th,td,form,fieldset,legend,input,button,textarea,menu { margin: 0; padding: 0; box-sizing: border-box;}html,body { /* 禁止选中文本 */ -webkit-user-select: none; user-select: none; font: Oswald, 'Open Sans', Helvetica, Arial, sans-serif}/* 禁止长按链接与图片弹出菜单 */a,img { -webkit-touch-callout: none;}/*ios android去除自带阴影的样式*/a,input { -webkit-tap-highlight-color: rgba(0, 0, 0, 0);}input[type="text"] { -webkit-appearance: none;}3. 公共样式提取/* 禁止选中文本 */.usn{ -webkit-user-select:none; -moz-user-select:none; -ms-user-select:none; -o-user-select:none; user-select:none;}/* 浮动 */.fl { float: left; }.fr { float: right; }.cf { zoom: 1; }.cf:after { content:"."; display:block; clear:both; visibility:hidden; height:0; overflow:hidden;}/* 元素类型 */.db { display: block; }.dn { display: none; }.di { display: inline }.dib {display: inline-block;}.transparent { opacity: 0 }/*文字排版、颜色*/.f12 { font-size:12px }.f14 { font-size:14px }.f16 { font-size:16px }.f18 { font-size:18px }.f20 { font-size:20px }.fb { font-weight:bold }.fn { font-weight:normal }.t2 { text-indent:2em }.red,a.red { color:#cc0031 }.darkblue,a.darkblue { color:#039 }.gray,a.gray { color:#878787 }.lh150 { line-height:150% }.lh180 { line-height:180% }.lh200 { line-height:200% }.unl { text-decoration:underline; }.no_unl { text-decoration:none; }.tl { text-align: left; }.tc { text-align: center; }.tr { text-align: right; }.tj { text-align: justify; text-justify: inter-ideograph; }.wn { /* 强制不换行 */ word-wrap:normal; white-space:nowrap;}.wb { /* 强制换行 */ white-space:normal; word-wrap:break-word; word-break:break-all;}.wp { /* 保持空白序列*/ overflow:hidden;text-align:left;white-space:pre-wrap;word-wrap:break-word;word-break:break-all;}.wes { /* 多出部分用省略号表示 , 用于一行 */ overflow:hidden; word-wrap:normal; white-space:nowrap; text-overflow:ellipsis;}.wes-2 { /* 适用于webkit内核和移动端 */ display: -webkit-box; -webkit-box-orient: vertical; -webkit-line-clamp: 2; overflow: hidden;} .wes-3 { display: -webkit-box; -webkit-box-orient: vertical; -webkit-line-clamp: 3; overflow: hidden;}.wes-4 { display: -webkit-box; -webkit-box-orient: vertical; -webkit-line-clamp: 4; overflow: hidden;}/* 溢出样式 */.ofh { overflow: hidden; }.ofs {overflow: scroll; }.ofa {overflow: auto; }.ofv {overflow: visible; }/* 定位方式 */.ps {position: static; }.pr {position: relative;zoom:1; }.pa {position: absolute; }.pf {position: fixed; }/* 垂直对齐方式 */.vt {vertical-align: top; }.vm {vertical-align: middle; }.vb {vertical-align: bottom; }/* 鼠标样式 */.csd {cursor: default; }.csp {cursor: pointer; }.csh {cursor: help; }.csm {cursor: move; }/* flex布局 */.df-sb { display:flex; align-items: center; justify-content: space-between;}.df-sa { display:flex; align-items: center; justify-content: space-around;}/* 垂直居中 */.df-c { display: flex; align-items: center; justify-content: center;}.tb-c { text-align:center; display:table-cell; vertical-align:middle;}.ts-c { position: absolute; left: 50%; top: 50%; transform: translate(-50%, -50%);}.ts-mc { position: absolute; left: 0;right: 0; bottom: 0; top: 0; margin: auto;}/* 辅助 */.mask-fixed-wrapper { width: 100%; height: 100%; position: fixed; left:0;top:0; background: rgba(0, 0, 0, 0.65); z-index: 999;}.bg-cover { background-size: cover; background-repeat: no-repeat; background-position: center center;}.bg-cover-all { background-size: 100% 100%; background-repeat: no-repeat; background-position: center center;}以上都是经常用到的方法
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标签： #js限制文本长度
