//扩展运算符可以将数组拆分成以逗号分隔的参数序列
let ary =['a','b','c']
//...ary //'a','b','c'
console.log(...ary);
console.log('a','b','c');
//扩展运算符合并数组
let ary1 =[1,2,3]
let ary2 = [4,5,6]
//方法一
let ary3 = [...ary1,...ary2]
//方法二
ary1.push(...ary2)
利用扩张运算符将伪数组转换为真正的数组
var oDivs=document.getElementsByTagName('div');
console.log(oDivs);
var ary= [...oDivs];
console.log(ary);
