扩展 ES5 函数（使用原生 JS 模仿 Vue 组合 API）

function Component (node) {

   const test1 = "I am a private variable"
   this.test2 = "I am a public variable"
      
   getProps = () => {
      return test1; // I am a private method with access to component variables
   }

   onTimeout = (callback) => {
      setTimeout(callback, 1000);
   }
   
};

function Media (node) {
      
   Component.call(this, node); // copies public variables and methods 
   const sup = Object.assign({}, this); // acts like super in es6 classes
   const props = getProps();

   console.log(sup)
   console.log(props)

   onTimeout(() => {
      console.log("I am executed on timeout")
   })
      
}

new Media();