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                ## 擴展 內置對象的prototype 是不允許修改的.所以對內置對象的原型對象新增方法只能通過下面的方式,不能通過Array.prototype = { }的方式. ``` var arr = [4, 2, 6, 7, 8]; Array.prototype.getSum = function () { var sum = 0; for (let i = 0; i < this.length; i++) { if (this[i] % 2 === 0) { sum += this[i]; } } return sum; } console.log(arr.getSum()); ```
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