前言：
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js html input file 类型 实现图片上传
这里只单独讲如何用JS 把选中的文件转成base64 ，然后输出到前台显示
直接上代码：
AddArticle.jsp
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%><!DOCTYPE HTML><html> <head> <base href="<%=basePath%>"> <title>写文章-白雨青工作站</title> <meta http-equiv="pragma" content="no-cache"> <meta http-equiv="cache-control" content="no-cache"> <meta http-equiv="expires" content="0"> <meta http-equiv="keywords" content="小说,我有一剑,Java,HTML,Java小工具,白雨青工作站,;> <meta name="description" content="小说,我有一剑,Java,HTML,Java小工具,白雨青工作站,;> <!----> <link rel="shortcut icon" href="img/byqws-apple-touch-icon-16X16.png" /> <link rel="apple-touch-icon" href="img/byqws-apple-touch-icon-57X57.png" /> <link rel="apple-touch-icon" sizes="72x72" href="img/byqws-apple-touch-icon-72X72.png" /> <link rel="apple-touch-icon" sizes="114x114" href="img/byqws-apple-touch-icon-144X144.png" /> <link rel="stylesheet" type="text/css" href="Background/css/addArticle.css"> <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no"> <script type="text/javascript" src="js/jquery-1.4.min.js"></script> <script src="Background/js/tinymce/tinymce.min.js" type="text/javascript" charset="utf-8"></script> <script src="Background/js/tinymce/langs/zh-Hans.js" type="text/javascript" charset="utf-8"></script> <!--汉化--> <script type="text/javascript" src="Background/js/AddArticle.js"></script> <script type="text/javascript" src="Background/js/mytinymce.js"></script> <script type="text/javascript" src="Background/js/uploadImg.js"></script> </head> <body> <div class='main'> <div class='title'> <label >添加一篇文章</label> </div> <div class='FTitle_div'> <input id="FTitle" class='FTitle' placeholder = '请输入标题'></input> </div> <div class='FAbstract_div'> <input id="FAbstract" class='FAbstract' placeholder = '请输入摘要'></input> </div> <div class='content_div'> <textarea id="content" class='content'></textarea> </div> <div class="FCover">封面图片</div> <div class="upload-piclist"> <div class="upload-file"> <input type="file" id="file" accept="image/*" multiple onchange="imgChange()"/> </div> </div> <input id="submitbutton" class='submitbutton' type = 'button' value = '提交'></input></div> </body></html>
<script type="text/javascript" src="Background/js/uploadImg.js"></script>
引入转base64后前台显示JS文件
uploadImg.js
let picmax = 20; //限制上传数量 function imgChange() { let file = document.getElementById('file').files; let imglist = document.querySelectorAll('.upload-Picitem'); let piclist = document.getElementsByClassName('upload-piclist')[0]; let filelist = file.length + imglist.length > picmax ? 9 - imglist.length : file.length + imglist.length; if (file.length + imglist.length >= 9) { let uploadfile = document.getElementsByClassName('upload-file')[0] uploadfile.style.display = "none" } for (let i = 0; i < filelist; i++) { readerfile(file[i]).then(e => { let html = document.createElement('div'); html.className = 'upload-Picitem' html.innerHTML = '<img src=' + e + ' alt="pic">' piclist.appendChild(html); }) }}function readerfile(file) { return new Promise((resolve, reject) => { let reader = new FileReader(); reader.addEventListener("load", function() { resolve(reader.result); }, false) if (file) { reader.readAsDataURL(file) } })}//提交function submit() { let imglist = [] //let text = document.getElementsByClassName('upload-textarea')[0].value let piclist = document.querySelectorAll('.upload-Picitem'); for (let i = 0; i < piclist.length; i++) { imglist.push(piclist[i].lastChild.src) } //console.log("发布内容：", text) console.log("图片列表：", imglist)}直接看结果
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标签： #jquery获取图片类型
