Javascript code for alphanumeric validation

Following is the code for the alphanumeric validation in JavaScript 

 Javascript | 
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<script type="text/javascript">
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function alphanumeric(abc)
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{
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 var numaric = abc;
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 for(var j=0; j<numaric.length; j++)
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 {
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   var alphaa = numaric.charAt(j);
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   var hh = alphaa.charCodeAt(0);
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   if((hh > 47 && hh<58) || (hh > 64 && hh<91) || (hh > 96 && hh<123))
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   {
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   }
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 else {
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                         alert("value entered is not alphanumeric");
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  return false;
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   }
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  }
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 return true;
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}
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</script>
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