Remove spaces before and after the string in Javascript

Remove spaces before and after the string in Javascript
Function string. Prototype. Trim (){
Return this. tostring (). Replace (/^ \ s + | \ s + $/g ,"");
}
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<Script language = JavaScript>
Function string. Prototype. Trim () {return this. Replace (/(^ \ s *) | (\ s * $)/g ,"");}
Function string. Prototype. ltrim () {return this. Replace (/(^ \ s *)/g ,"");}
Function string. Prototype. rtrim () {return this. Replace (/(\ s * $)/g ,"");}
VaR STR = "trim ";
Alert (Str. Trim ());
</SCRIPT>
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Returns the value of the comma before and after removing the string.
Onblur = 'this. value = This. value. tostring (). Replace (/(^ \, *) | (\, * $)/g ,"")'