JavaScript中构造函数与原型链之间的关系详解

 <script>
  function Demo(){
       
   }
   var demo = new Demo()
   var data= demo.prototype = function(){
 
   }
   
   console.log(demo.__proto__)
   console.log(data.constructor )
   console.log(data.prototype.__proto__)
   console.log(demo.constructor.prototype)
   console.log(demo.constructor)
  输出
  {constructor: ƒ}constructor: ƒ Demo()__proto__: Object
  ƒ Function() { [native code] }
  {constructor: ƒ, __defineGetter__: ƒ, __defineSetter__: ƒ, hasOwnProperty: ƒ, __lookupGetter__: ƒ, …}
  {constructor: ƒ}
  ƒ Demo(){  }
</script>