JavaScript常用方法

 join() 方法

将数组元素转换为字符串

var fruits = ["a", "b", "c", "d"];
var energy = fruits.join("-");
console.log(energy) //"a-b-c-d"

 sort() 方法

对象数组根据某一个对象属性排序

例如一个对象数组
arr = [{name:'zhangsan',age:18},{name:'lisi',age:12},{name:'wangwu',age:17},{name:'zhaoliu',age:15},]按照每个对象的年龄排序
arr.sort((a,b)=>{return a.age-b.age})
打印arr即可得到[{name: 'lisi', age: 12}, {name: 'zhaoliu', age: 15},{name: 'wangwu', age: 17},{name: 'zhangsan', age: 18}]