js和php数字位数格式化自动补0

php

<?php//"%05d" 补全5位   $value 值sprintf("%05d",$value)sprintf("%05d",120);//00120sprintf("%03d",1);//001?>

js:

//value 值，num 位数fix(value,num); fix(12,4);//0012function fix(num, length) {  return ('' + num).length < length ? ((new Array(length + 1)).join('0') + num).slice(-length) : '' + num;}