<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>格式化数字</title>
</head>
<body>
<script type="text/javascript">
/**
方法一 不加千分位（整数部分最大15位，小数为最多4位）
object --文本框对象
n --保留的小数位
*/
function fmoney(object,n){
// ^-?[0-9]+\.?[0-9]*$ 验证浮点数
var num = object.value;
var start = num.indexOf('-');
if(start == 0){
num = num.substring(1,15);
}else{
num = num.substring(0,15);
}
num = parseFloat((num + "").replace(/[^\d\.-]/g, "")).toFixed(n) + "";
if (isNaN(num) || ((num + "").replace(/\s/g, "")) == "") {
object.value = "";
return;
}
n = n > 0 && n <= 20 ? n : 2;
var l = num.split(".")[0].split("").reverse(),r = num.split(".")[1],t = "";
for(var i = 0; i < l.length; i ++ ){
//t += l[i] + ((i + 1) % 3 == 0 && (i + 1) != l.length ? "," : ""); //加千分位
t += l[i];
}
if(start == 0){
object.value = "-"+t.split("").reverse().join("") + "." + r;
}else{
object.value = t.split("").reverse().join("") + "." + r;
}
}
/**
方法二 加千分位 （整数部分最大15位）
object --文本框对象
n --保留的小数位
*/
function simpleFormat(object,n){
var num = object.value;
num = num.substring(0,15);
num = parseFloat((num + "").replace(/[^\d\.-]/g, "")).toFixed(n)+"";
if (isNaN(num) || ((num + "").replace(/\s/g, "")) == "") {
object.value = "";
return;
}
object.value = num;
var value = num.replace(/(\d)(?=(\d{3})+(?!\d))/g, "$1,")
object.value = value;
}
function rmoney(s){
return parseFloat(s.replace(/[^\d\.-]/g, ""));
}
</script>
<input type="text" id="11" style="width:200px" onblur='fmoney(this,4)'/><input type="button" value="还原" onclick="r11()"><br>
<input type="text" id="33" style="width:200px" onblur='simpleFormat(this,4)'/><input type="button" value="还原" onclick="r33()">
<script type="text/javascript">
function r11(){
var value = document.getElementById("11").value;
alert(rmoney(value));
}
function r33(){
var value = document.getElementById("33").value;
alert(rmoney(value));
}
</script>
</body>
</html>