ES6 Array 新特性

(1)使用扩展运算符(...)拷贝数组

// bad
const len = items.length;
const itemsCopy = [];
let i;

for (i = 0; i < len; i++) {
  itemsCopy[i] = items[i];
}

// good
const itemsCopy = [...items];

(2)使用 Array.from 方法,将类似数组的对象转为数组

const foo = document.querySelectorAll('.foo');
const nodes = Array.from(foo);

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