Example of the add-to-zero operation before JavaScript and javascript instance

Example of the add-to-zero operation before JavaScript and javascript instance

The example in this article describes how to perform the zero-padding operation before JavaScript. Share it with you for your reference. The details are as follows:

Most of the time, in order to display the format, the first 0 must be performed if a character string is not in the correct position.

1. Traditional code

/*** Add 0 before operation * @ param number String to be operated * @ param length int destination length */function addZero (number, length) {var buffer = ""; if (number = "") {for (var I = 0; I <length; I ++) {buffer + = "0 ";}} else {if (length <number. length) {return "";} else if (length = number. length) {return number;} else {for (var I = 0; I <(length-number. length); I ++) {buffer + = "0";} buffer + = number ;}} return buffer ;}

2. This code is more concise

Function addZero (str, length) {return new Array (length-str. length + 1). join ("0") + str ;}

I hope this article will help you design javascript programs.