1.static —>静态变量或静态方法

  1. 静态变量是不能被改变的
  2. 静态方法是不能被重写的
  3. 静态方法直接通过类名调用—>(方便调用)
  4. 静态方法中不能调用非静态的方法
    1. <script>
    2.      class Person{
    3.          sayAge(){
    4.              console.log(18)
    5.          }
    6.          static sayName(){
    7.              this.sayAge()
    8.              console.log("hello")
    9.          }
    10.      }
    11.      var p = new Person();
    12.      Person.sayName()
    13.  </script>

    2.static-extends

    1. <srcipt>
    2. class person(){
    3.   static request(){
    4.     console.log("hello world")
    5.   }
    6. }
    7. class student extends person{
    8.   static getTop250(){
    9.     this.request()
    10.   }
    11. }
    12. </script>

    2.1例子—请求网易云—华语

    HTTP.js
    1. var baseUrl="https://music.aityp.com/";
    2. class HTTP{
    3.  static request({url,data}){
    4.    return new Promise((resolve,reject)=>{
    5.       wx.request({
    6.         url:baseUrl+url,
    7.         data,
    8.         header:{'content-type':'aplication/json'},
    9.         method:'GET',
    10.         dataType:'json',
    11.         responseType:'text',
    12.         success:(res)=>{
    13.           resolve(res)
    14.         },
    15.         fail:(err)=>{
    16.           reject(err)
    17.         }
    18.       });  
    19.    }
    20.    module.exports=HTTP;
    IndexModel.js
    1. const HTTP=require('./HTTP')
    2. class IndexModel extends HTTP{
    3. static getMusic(){
    4.  return this.request({
    5.    url:'top/playlist',
    6.    data:{
    7.      cat:"华语"
    8.    }
    9.  })
    10. }
    11. }
    12. module.expots=IndexModel;