数组的forEach方法
Array.prototype.MyForEach = function (callback) {
for (let i = 0; i < this.length; i++) {
callback(this[i], i, this);
}
};
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数组的forEach方法Array.prototype.MyForEach = function (callback) {
for (let i = 0; i < this.length; i++) {
callback(this[i], i, this);
}
};