javascript原型：写一个合并后数组去掉同类项的方法

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<!DOCTYPE html>
<html>
<head>
<title>test013_Array_prototype_unique()</title>
</head>
<script type="text/javascript">
Array.prototype.unique = function() {
var a = {};
for (var i = 0; i < this.length; i++) {
if (typeof a[this[i]] == "undefined")
a[this[i]] = 1;
}
this.length = 0;
for(var i in a)
this[this.length] = i;
return this;
};
</script>
<script type="text/javascript">
var a = [1,2,3];
var b = [2,3,4];
var c = a.concat(b).unique();
console.log(c);
</script>
<body>
</body>
</html>