How to Implement trim () using JS

Source: Internet
Author: User
Tags rtrim

---------------------------------- Js to space ----------------------------------

Remove spaces between the left and right sides of the string. You can easily use TRIM, ltrim, or rtrim In VBScript. However, these three built-in methods are not available in JS and need to be written manually. The following implementation method uses a regular expression, which is efficient and adds the three methods to the built-in methods of the string object.

The method format for writing a class is as follows: (Str. Trim ();)

<Script language = "JavaScript">
String. Prototype. Trim = function (){
Return this. Replace (/(^ \ s *) | (\ s * $)/g ,"");
String. Prototype. ltrim = function (){
Return this. Replace (/(^ \ s *)/g ,"");
String. Prototype. rtrim = function (){
Return this. Replace (/(\ s * $)/g ,"");

You can write a function as follows: (TRIM (STR ))

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