JavaScript implements code for text sorting according to pinyin

<title>JavaScript sorts text by pinyin</title>
<SCRIPT type="text/javascript">
function defaultSort(){
var a="zhongguo,daguo,world,China,superpower";
a=(",");
();
alert(a);
}
function cusSort(){
var a="zhongguo,daguo,world,China,superpower";
a=(",");
(function(a,b){
  return (b);
});
alert(a);
}
</SCRIPT>
<a href="#" onClick="defaultSort();">Default sort</a><br>
<a href="#" onClick="cusSort();">Sort by pinyin</a>