js数组去重

<!Doctype html>
<html>
<head></head>
<body>
   <h2>JS数组去重</h2>
   <h3>原数组：[1,2,1,5,6,2,5,6,7]</h3>
   <h3>去重后的数组：<i id="newArr"></i></h3>
   <script>
        var arr1 = [1,2,1,5,6,2,5,6,7];
        var arr2 = [];
        var newArr = "[";
        for(var i=0;i<arr1.length;i++){
            if(arr2.indexOf(arr1[i]) <= -1){
                arr2.push(arr1[i]);
                newArr += arr1[i] +","
            }
        }
        /*以下代码只是为了将结果打印在页面上*/
        newArr = newArr.slice(0,newArr.length-1);
        newArr += "]";
        document.getElementById("newArr").innerHTML = newArr;
   </script>
</body>
</html>
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