<!DOCTYPE html>
<html lang="en">
<head>
<script type="text/javascript">
function unique(arr){
var tmp = new Array();
for(var i in arr){
if(tmp.indexOf(arr[i])==-1){
tmp.push(arr[i]);
}
}
return tmp;
}
var student = ['qiang','ming','tao','li','liang','you','qiang','tao'];
alert(unique(student));
</script>
</head>
<body>
</body>
</html>
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