js 金额格式化-千位分隔符

function submoney(value){
var b = false;
if (value == null || value == "") return "0";
value = value.toString();
if(value.indexOf('-') != -1){
b= true;
value = value.substring(1,value.length);
}
if (/^-?[0-9]+(.[0-9]+)?$/.test(value)){
value = value.toString().replace(/^(\d)$/, "$1.");
value = (value + "00").replace(/(\d.\d\d)\d*/, "$1");
value = value.replace(".", ",");
var re = /(\d)(\d{3},)/;
while (re.test(value))
value = value.replace(re, "$1,$2");
value = value.replace(/,(\d\d)$/, ".$1");
}
if(b){
value = "-"+value;
}
return value;
}