前言：
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function isNum(value) {
return typeof value === 'number' && !isNaN(value);
}
//加
function accAdd(arg1, arg2) {
var r1, r2, m, result;
try {
r1 = arg1.toString().split(".")[1].length;
} catch (e) {
r1 = 0;
}
try {
r2 = arg2.toString().split(".")[1].length;
} catch (e) {
r2 = 0;
}
m = Math.pow(10, Math.max(r1, r2));
result = (arg1 * m + arg2 * m) / m;
if (isNum(result)) {
return result;
} else {
return 0;
}
}
//减function Subtr(arg1, arg2) { var r1, r2, m, n, result; try { r1 = arg1.toString().split(".")[1].length; } catch (e) { r1 = 0; } try { r2 = arg2.toString().split(".")[1].length; } catch (e) { r2 = 0; } m = Math.pow(10, Math.max(r1, r2)); //动态控制精度长度 n = (r1 >= r2) ? r1 : r2; result = parseFloat(((arg1 * m - arg2 * m) / m).toFixed(n)); if (isNum(result)) { return result; } else { return 0; }}
//乘function accMul(arg1, arg2) { var m = 0, result, s1 = arg1.toString(), s2 = arg2.toString(); try { m += s1.split(".")[1].length; } catch (e) { console.log(e); } try { m += s2.split(".")[1].length; } catch (e) { console.log(e); } result = Number(s1.replace(".", "")) * Number(s2.replace(".", "")) / Math.pow(10, m); if (isNum(result)) { return result; } else { return 0; }}
//除function accDiv(arg1, arg2) { //如果除数是0，直接返回0 if (arg2 == '0') { return 0; } var t1 = 0, t2 = 0, r1, r2, result; try { t1 = arg1.toString().split(".")[1].length; } catch (e) { console.log(e); } try { t2 = arg2.toString().split(".")[1].length; } catch (e) { console.log(e); } r1 = Number(arg1.toString().replace(".", "")); r2 = Number(arg2.toString().replace(".", "")); //这里进行乘法运算，浮点数乘法运算也会出现精度问题，所以依赖accMul result = accMul((r1 / r2), Math.pow(10, t2 - t1)) if (isNum(result)) { return result; } else { return 0; }}
标签： #js计算和
