How to remove spaces in the string using JS? (Method summary)

This article mainly introduces to you three methods of js to remove string spaces.

During our front-end interview process, one of the common interview questions is how to use js to remove spaces from strings. So for front-end newbies, it may be difficult to remove spaces in js.

First of all, everyone should know what js is.

JavaScript (abbreviated as Js) is the most popular scripting language in the world, because all web pages you browse on computers, mobile phones, tablets, and countless mobile apps based on HTML5 have interactive logic. Powered by JavaScript. Simply put, JavaScript is an interpreted programming language that runs in the browser.

Below we will continue to summarize three ways to solve js's string spaces removal.

The first method: use replace regular matching

If you don’t know the relevant knowledge of regular matching, it is recommended to refer to [Regular Expression Video Tutorial]

str = str.replace(/\s*/g,"");// 去除所有空格

str = str.replace(/^\s*|\s*$/g,"");//去除两头空格

str = str.replace( /^\s*/, “”);//去除左空格

str = str.replace(/(\s*$)/g, "");//去除右空格

Code example to remove spaces in str:

var str = " 45 45 ";
var str2 = str.replace(/\s*/g,"");
console.log(str2); // 4545

Second method: use str.trim()

Code example:

var str = "   php  cn   ";
var str2 = str.trim();
console.log(str2);

Note: str.trim() cannot remove the spaces in the middle, while str.trimLeft() and str.trimRight() are used to remove the spaces on the left and right of the string respectively.

Third method: Use jquery, $.trim(str)

var str = "   php  cn   ";
var str2 = $.trim(str)
console.log(str2);

Note: $.trim(str) limitations: the spaces in the middle cannot be removed.

This article is a summary of the three methods of js to remove spaces in the middle of strings. I hope it will be helpful to friends in need!

If you want to know more about js, you can follow the PHP Chinese website JavaScript video tutorial, everyone is welcome to refer to and learn!

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