js number add zero before
('0' + 11).slice(-2) // '11'
('0' + 4).slice(-2) // '04'
js number add zero before
('0' + 11).slice(-2) // '11'
('0' + 4).slice(-2) // '04'
js append zeros
var str = "5";
alert(str.lpad("0", 4)); //result "0005"
var str = "10"; // note this is string type
alert(str.lpad("0", 4)); //result "0010"
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