项目开发中想对金额输入的文本框进行格式化，以3位数自动格式化金额，下面青岛星网跟大家分享下JS的实现函数。
<script>
function cc(s){
if(/[^0-9\.]/.test(s)) return "invalid value";
s=s.replace(/^(\d*)$/,"$1.");
s=(s+"00").replace(/(\d*\.\d\d)\d*/,"$1");
s=s.replace(".",",");
var re=/(\d)(\d{3},)/;
while(re.test(s))
s=s.replace(re,"$1,$2");
s=s.replace(/,(\d\d)$/,".$1");
return s.replace(/^\./,"0.")
}
</script><input onchange="this.value=cc(this.value)">
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