js space removal techniques to remove spaces before and after the string and left and right spaces_javascript techniques

Remove the spaces before and after the string, on the left and on the right

Copy the code The code is as follows:

String. prototype.trim = function(){ return this.replace(/^s |s $/g,"")}
String.prototype.ltrim = function(){ return this.replace(/^s /g, "")}
String.prototype.rtrim = function(){ return this.replace(/s $/g,"")}

Add a trim method to the String object.
You can use it like this in the future:

Copy code The code is as follows:

var s = " abc ";
s = s.trim(); // s is a String, you can use the trim method just defined.
alert(s);