• 重写prototype，一般用于做数据拦截

let newProtos = Object.create(Array.prototype)

newProtos.push = function () {
    console.log('can do something，被拦截了')
    // return Array.prototype.push.apply(this, arguments)
    return [].push.apply(this, arguments)
}

let arr = [1, 2, 3, 6]
// 被拦截
arr.__proto__ = newProtos
console.log(arr.push(8))      //5
console.log(arr)    // [ 1, 2, 3, 6, 8 ]

// 没被拦截
let arr2 = [10, 11, 12, 13, 14]
console.log(arr2.push(16))      //6
console.log(arr2)   // [ 10, 11, 12, 13, 14, 16 ]