如何判断JavaScript 数组含有重复值

var ary = new Array("aaa","cc","dd","aaa");
var s = ary.join(",")+",";
for(var i=0;i<ary.length;i++) {
if(s.replace(ary[i]+",","").indexOf(ary[i]+",")>-1) {
alert("数组中有重复元素:" + ary[i]);
break;
}
}

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