修改原型给数组对象添加forEach

2024-08-25 11:15:06

 Array.prototype.forEach = function (callback, context) {

        for (var i = 0; i < this.length; i++) {

            callback.call(context || null, this[i], i, this);

        }

    }

    var arr = ["a", "b","c"];

   arr.forEachs(function (value, index, array) {

        debugger;

    });

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