js trim function to delete spaces at both ends

This article mainly introduces to you the function of deleting spaces at both ends of the js custom trim function, and analyzes the related operation skills of javascript based on regular replacement to implement similar trim functions to delete spaces at both ends of the string. I hope it can help you. .

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

There is no trim function in js

//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 extended 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’s$.trim(str)

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

Related recommendations:

php trim function ltrim function the difference between rtrim function

trim function implementation of trim function in php Code

Implementation of trim function code in php_PHP tutorial

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