js求两个数组的并集

定义两个数组，从而返回两个数组的并集，去掉两个数组中重复的内容。

function mergeArray(arr1, arr2) {var arr = [];for (var i = 0; i < arr1.length; i++) {arr.push(arr1[i]);}var dup;for (var i = 0; i < arr2.length; i++){dup = false;for (var i = 0; i < arr1.length; i++){if (arr2[i] == arr1[i]){dup = true;break;}}if (!dup){arr.push(arr2[i]);}}return arr;}