JavaScript takes out strings and trailing spaces

Write JavaScript performance trim () before and after removing the function of the empty string, the string replace () method removes the empty string from the end to the end. Trim () For example, for the code below the function key:

<script type= "Text/javascript" >  function Trim () {var str = document.getElementById ("str"); var strvalue = Str.value;if (strvalue = = "") {alert ("Please enter the original string"); Str.focus (); return;} Else{var objexp =/(^\s*) | ( \s*$)/g;strvalue = Strvalue.replace (Objexp, "");} Str.value = strvalue;    }  </script>

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JavaScript takes out strings and trailing spaces