How to replace spaces with javascript

How to replace spaces in JavaScript: 1. Use "name.replace(" ","");" to replace; 2. Use "replace(new RegExp(/( )/g),""); "; 3. Use "name.split(" ").join("");" and so on.

The operating environment of this article: windows7 system, javascript version 1.8.5, Dell G3 computer.

Replacing spaces in the input box in JS is a very common operation when processing form requirements to prevent data anomalies caused by user operating habits and ensure the security of parameter transfer.

NO.1

name.replace(" ","");

The above method is a very simple replacement, but it has two weaknesses:

1. It can only replace a single English space or Chinese space (full-width) ;

2. Only the first match of the current string can be replaced.

NO.2

name.replace(new RegExp(/( )/g),"");

The above method uses regular matching and can replace all, but there is still a weakness:

1. Only English spaces or Chinese spaces can be replaced (full-width).

NO.3

name.split(" ").join("");

The above method is to separate and merge by characters, which can replace all, but there is still a weakness:

1. It can only replace English spaces or One of Chinese spaces (full width).

NO.4

name.replace(/(^\s*)|(\s*$)/g,"");

The above method uses regular matching and can replace English or Chinese spaces, but there is a weakness:

1. It can only replace the leading and trailing spaces. Does not work on spaces in the middle of the string.

Ultimate Killing Move

name.replace(/\s+/g,"");

The above method is through regular matching, which can replace English or Chinese spaces and replace them all.

[Note] There is no so-called replaceAll method in JS. The author's test result is "undefined" and cannot be recognized on the page. Of course, there is also a workaround, which is to rewrite the prototype of the replaceAll method based on the function of replace:

String.prototype.replaceAll = function(reallyDo, replaceWith, ignoreCase) { 
    if (!RegExp.prototype.isPrototypeOf(reallyDo)) { 
        return this.replace(new RegExp(reallyDo, (ignoreCase ? "gi": "g")), replaceWith); 
    } else { 
        return this.replace(reallyDo, replaceWith); 
    } 
}

[Recommended learning: javascript advanced tutorial]

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