JS to remove string spaces (whitespace characters)

The following three methods are used to remove spaces within a string using JS:

(1) Replace regular matching method

Remove all spaces within the string: str = str.replace (/\s*/g, "");

Remove spaces in both ends of the string: str = str.replace (/^\s*|\s*$/g, "");

Remove the left space inside the string: str = str.replace (/^\s*/, "");

Remove spaces to the right of the string: str = str.replace (/(\s*$)/g, "");

　　Example:

var str = "6 6"; var str_1 = str.replace (/\s*/g, ""//

var str = "6 6"; var str_1 = str.replace (/^\s*|\s*$/g, "");  //6 6//No spaces on both left and right side of output

var str = "6 6"; var str_1 = str.replace (/^\s*/, "");  //6 6//output to the right there are no spaces to the left

var str = "6 6"; var str_1 = str.replace (/(\s*$)/g, ""); 6 6//output There is no space to the right of the left   

(2) Str.trim () method

The trim () method is used to remove white space characters at both ends of a string and to return, and the trim method does not affect the original string itself, it returns a new string.

Flaw: can only remove the space at both ends of the string, cannot remove the middle space

　　Example:

var str = "6 6"; var str_1 = Str.trim ()//6 6//no spaces on left and right side of output

The left space is removed separately using str.trimleft (); var str_1 = Str.trimleft ();

The right space is removed separately using str.trimright ();//var str_1 = Str.trimright ();

(3) JQ method: $.trim (str) method

The $.trim () function is used to remove whitespace characters at both ends of a string.

　　Note:the $.trim () function removes all line breaks at the beginning and end of the string, spaces (including contiguous spaces), and tabs. If these whitespace characters are in the middle of a string, they will be preserved and will not be removed.

　　Example:

var str = "6 6"; var str_1 =//6 6//output no spaces on left and right side

JS to remove string spaces (whitespace characters)