Array.prototype.push

单个值添加到现有数组末尾:

var arr = ["头条", "@", "新浪潮"];
arr.push("添加我");
console.log(arr);

单个值添加到现有数组开头:

var arr = ["头条", "@", "新浪潮"];
arr.unshift("添加我到头部");
console.log(arr);

多个值附加到数组末尾中:

var arr = ["头条", "@", "新浪潮"];
arr.push("添加我", "添加你");
console.log(arr);

将一个数组的项添加到另一个数组

let arr = ["头条", "@", "新浪潮"];
let waitToAdd = ["添加我", "添加你"];
arr = arr.concat(waitToAdd);
console.log(arr);

Es6中的写法

let arr = ["头条", "@", "新浪潮"];
arr = [...arr, "添加我"];
console.log(arr);

let arr = ["头条", "@", "新浪潮"];
let waitToAdd = ["添加我", "添加你"];
arr = [...arr, ...waitToAdd];
console.log(arr);