Add a Trim,ltrim,rtrim method to a String object in JavaScript _javascript tips

Here's how we use this property to add three methods to a String object: Trim,ltrim,rtrim (acting like a function with the same name in VBScript)

Copy Code code 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, "");
}

How, simple, look at one of the examples used:

Copy Code code as follows:

<script language=javascript>
String.prototype.Trim  = function ()
{
    return this.replace (/(^\s*) | ( \s*$)/g,  "");
}
var s =      leading and trailing spaces      ";
Window.alert (s +  "  ("  + s.length + ) ");
S = s.trim ();
Window.alert (s +  "  ("  + s.length + ) ");
</script>