function commafy(num) { num = num + ''; var reg = /(-?\d+)(\d{3})/; if(reg.test(num)){ num = num.replace(reg, '$1,$2'); } return num;}commafy(1234);
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function commafy(num) { num = num + ''; var reg = /(-?\d+)(\d{3})/; if(reg.test(num)){ num = num.replace(reg, '$1,$2'); } return num;}commafy(1234);
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