How to use custom trim function in js

This time I will bring you how to use the custom trim function of js. What are the precautions when using the custom trim function of js. The following is a practical case, let's take a look.

Compatible with IE lower version browsers and some other lower version script browsers

There is no trim function in js itself

//删除左右两端的空格
function trim(str){
 return str.replace(/(^\s*)|(\s*$)/g, "");
}
//删除左边的空格
function ltrim(str){
 return str.replace(/(^\s*)/g,"");
}
//删除右边的空格
function rtrim(str){
 return str.replace(/(\s*$)/g,"");
}

Or extend the String type attribute

String.prototype.trim = function()
{
 return this.replace(/(^\s*)|(\s*$)/g, "");
}
var str = document.getElementById("test").value;
alert( str.trim() );

Or simply give up using js and use jQuer$.trim(str)

var str = $("#test").val();
alert( $.trim(str) );

PS: Regular operations are used in the examples. Here are 2 very convenient regular expression tools for your reference:

I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related articles on the php Chinese website!

Recommended reading:

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