JS 原型模式创建对象

例子:

      class Test {
        constructor(val) {
          this.val = val
        }
        walk() {
          console.log(this)
          console.log('walk')
        }
        stop(){
          console.log('stop')
        }
      }
      let vm = new Test('jike')
      console.log(vm)

Test.prototype(就是控制台上的__proto__)指向原型对象,Test.prototype,constructor又指向类Test