Array.prototype.reduce可以实现很多功能,统计数组中各元素出现次数也是其中一个,代码如下:
var arr = [
1,
2,
35,
33,
5,
3,
3,
23,
5,
6,
1,
44,
33,
6];
var count = arr.reduce(
function(allElements, ele){
if (ele
in allElements) {
allElements[ele]++;
}
else {
allElements[ele] =
1;
}
return allElements;
}, {});
结果如下: