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JS converts numbers into three-digit comma-separated styles (sample code)_javascript skills

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WBOYOriginal
2016-05-16 16:59:431526browse

Copy code The code is as follows:

function formatNum(num)
{
if(!/^( |-)?(d )(.d )?$/.test(num)){alert("wrong!"); return num;}
var a = RegExp.$1, b = RegExp.$2, c = RegExp.$3;
var re = new RegExp().compile("(\d)(\d{3})(,|$)");
while(re .test(b)) b = b.replace(re, "$1,$2$3");
return a "" b "" c;

}

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