js 一个数组各元素出现的次数,并输出,怎么写代码答: var arr = [1, 5, 84, 4894, 44, 45, 454, 444, 515, 3, 4, 84, 4894, 44, 45, 454, 444, 515, 3, 4, 6, 6, 6, 6, 4];for (var i = 0; i < arr.length; i++) { if (arr.indexOf(arr[i]) == i) { var num = 1;for (var j = i + 1; j < ...
求助各位大神,js如何将下面的数组根据前面3个元素进行分类组装...答:var array =[[0,1,"src",{"datatime":201705230201}],[1,1,"dst",{"datatime":201705230205}],[0,1,"src",{"datatime":201705230202}],[1,1,"dst",{"datatime":201705230206}],[0,1,"dst",{"datatime":201705230204}],[1,1,"src",{"...