VIP26/day22/js/6.扩展运算符spread.js

/**
 * 扩展运算符(...) spread
 */

var arr = [1,2,3,4,5,6];
var b = [...arr];
b[0] = 8;
console.log(arr,'arr');
console.log(b,'b');

var a = [1,2,3];
console.log(...a,'...a');
var b = [2,3,4];
var c = [...a,...b];
// var c = a.concat(b);
console.log(c,'c');

// 类数组
/**
 *1.JavaScript 常见的类数组：arguments
 *2.获取Dom元素方法返回的结果（比如getElementsByTagName,getElementsByClassName,querySelectAll）
 */
// function fun1() {
//     console.log(arguments,'类')
// }
// fun1(1,2,3,4,5)
// fun1(arr,'arr')
let a1 = document.querySelectorAll("ul li");
console.log(a1,'a1')

// 将类数组 转成数组
let news = [...a1];
console.log(news,'news');

news.push(121);
console.log(news,'news');