<!DOCTYPE html>
<html>
<head>
<meta charset=utf-8>
</head>
<body>
<script type="text/javascript">
function _comma(number) {
// 补全代码
if(number>-999 && number < 999){
return String(number);
}
let num = String(number);
var count =0;
let resnum = new Array();
for(let i=num.length-1;i>=0;i--){
if(count == 3){
count =0;
resnum.push(',');
}
resnum.push(num[i]);
count++;
}
return resnum.reverse().join('');
}
</script>
</body>
</html>

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