js 多维数组转成一维数组

 1 var arr = [1, 2, [3, 4, [5, 6, 7]]];
 2 var resultArr = [];
 3 function forEachArr(arr) {
 4     for (var i = 0; i < arr.length; i++) {
 5         if (arr[i] instanceof Array) {
 6             arguments.callee(arr[i]);
 7 //            forEachArr(arr[i]);
 8         } else {
 9             resultArr.push(arr[i]);
10         }
11     }
12     return resultArr;
13 }
14 console.log(forEachArr(arr));