function Student(name){
  this.name = name;
 this.hello = function(){
   alert(`Hello,${this.name}`);
 }
 }

 var xiaoming = new Student("xiaoming");
 alert(xiaoming.name); // xiaoming
 xiaoming.hello(); // Hello,xiaoming

document.onreadystatechange = function(){
 // interactive表示文档已被解析，但浏览器还在加载其中链接的资源
 if(document.readyState === "interactive"){
  var xiaoming = new Student("xiaoming");
  alert(xiaoming.name);
  xiaoming.hello();
  console.log("xiaoming.__proto__：");
  console.log(xiaoming.__proto__);
  console.log("Student.prototype：");
  console.log(Student.prototype);
  console.log("xiaoming.__proto__ === Student.prototype：" + xiaoming.__proto__ === Student.prototype);
  console.log("Student.prototype.constructor：" + Student.prototype.constructor);
  console.log("Student.prototype.prototype：" + Student.prototype.prototype);
  console.log("Student.prototype.__proto__：");
  console.log(Student.prototype.__proto__);
  console.log(Object.prototype);
  console.log("Student.prototype.__proto__ === Object.prototype：" + Student.prototype.__proto__ === Object.prototype);
 }
}