JS数组去掉重复数据只保留一条的实现代码

var arr = [1,2,3,4,5,6,1,6,7,2];var newArr = [];for(var i =0;i<arr.length-1;i++){　　 if(newArr.indexOf(arr[i]) == -1){　　　　newArr.push(arr[i]);　　}}

function unique(arr) {var result = [], isRepeated;for (var i = 0, len = arr.length; i < len; i++) {isRepeated = false;for (var j = 0, len = result.length; j < len; j++) {if (arr[i] == result[j]) { isRepeated = true;break;}}if (!isRepeated) {result.push(arr[i]);}}return result;} 

function unique(arr) {var result = [], hash = {};for (var i = 0, elem; (elem = arr[i]) != null; i++) {if (!hash[elem]) {result.push(elem);hash[elem] = true;}}return result;//http://www.cnblogs.com/sosoft/}