我是歌谣 放弃很容易 但坚持一定很酷
公众号小歌谣 谢谢关注
前言
Foreach
Array.prototype.myForEach = function (cb) {
var _arr = this;
var _len = _arr.length;
var _arg2 = arguments[1] || window;
for (var i = 0; i < _len; i ++) {
cb.apply(_arg2, [_arr[i], i, _arr]);
}
}
Map
Array.prototype.myMap = function (cb) {
var _arr = this;
var _len = _arr.length;
var _arg2 = arguments[1] || window;
var _newArr = [];
var _item;
var _res;
for (var i = 0; i < _len; i ++) {
_item = deepClone(_arr[i]);
_res = cb.apply(_arg2, [_item, i, _arr]);
_res && _newArr.push(_res);
}
return _newArr;
}
Filter
Array.prototype.myFilter = function (cb) {
var _arr = this;
var _len = _