Js 去重复

 function Test1() {          
            var hashArr = {}, tempArr = []; //hashArr为hash表，tempArr为临时数组
            var arr = [1, 3, 2, 3, 5, 4, 2, 7];
            var d11 = new Date();
            var st = d11.getTime();
            for (var j = 0; j < 1000000; j++) {
                for (var i = 0,len=arr.length; i < len; i++)
                {
                    if (!hashArr[arr[i]])
                    {
                        hashArr[arr[i]] = true;
                        tempArr.push(this[i]);
                    }
                }
            }
            var d12 = new Date();
            var et = d12.getTime();           
            alert("Test1 Length:" + tempArr.length + "  And Time:" + (et - st) / 1000);
        }