代码如下：
引用
function fmoney(s, n)
{
n = n > 0 && n <= 20 ? n : 2;
s = parseFloat((s + "").replace(/[^\d\.-]/g, "")).toFixed(n) + "";
var l = s.split(".")[0].split("").reverse(),
r = s.split(".")[1];
t = "";
for(i = 0; i < l.length; i ++ )
{
t += l[i] + ((i + 1) % 3 == 0 && (i + 1) != l.length ? "," : "");
}
return t.split("").reverse().join("") + "." + r;
}
调用：fmoney("12345.675910", 3)，返回12,345.676
还原函数：
引用
function rmoney(s)
{
return parseFloat(s.replace(/[^\d\.-]/g, ""));
}
示例（可保存一下代码为html文件，运行查看效果）：
引用
<SCRIPT>
function fmoney(s, n)
{
n = n > 0 && n <= 20 ? n : 2;
s = parseFloat((s + "").replace(/[^\d\.-]/g, "")).toFixed(n) + "";
var l = s.split(".")[0].split("").reverse(),
r = s.split(".")[1];
t = "";
for(i = 0; i < l.length; i ++ )
{
t += l[i] + ((i + 1) % 3 == 0 && (i + 1) != l.length ? "," : "");
}
return t.split("").reverse().join("") + "." + r;
}
function rmoney(s)
{
return parseFloat(s.replace(/[^\d\.-]/g, ""));
}
function g(id)
{
return document.getElementById(id);
}
window.onload = function()
{
var num,
txt = g("txt"),
txt2 = g("txt2"),
btn = g("btn"),
btn2 = g("btn2"),
span = g("span");
btn.onclick = function()
{
num = parseInt(g("num").value);
txt.value = fmoney(txt.value, num);
txt2.value = fmoney(txt2.value, num);
}
;
btn2.onclick = function()
{
num = parseInt(g("num").value);
span.innerHTML = "=" + fmoney(rmoney(txt.value) + rmoney(txt2.value), num);
}
;
}
;
</SCRIPT>
小数点位数：
<select id="num">
<option value="2">2</option>
<option value="3">3</option>
<option value="4">4</option>
<option value="5">5</option>
</select>
<input type="text" id="txt" value="12345.675910"> +
<input type="text" id="txt2" value="1223"> <span id="span"></span>
<br>
<input type="button" id="btn" value="
格式化">
<input type="button" id="btn2" value="相加">