例子

demo

    <script>
        /* 学生类,name,age,skill
        sayName
         */
        /* 
        1、构造函数必须通过new关键字才可以调用
        2、this指向实例化的对象
         */
        function Student(name,age,skill){
            this.name = name;
            this.age = age;
            this.skill = skill;
        }
        Student.prototype.sayName = function(){
            console.log(this.name)
        }
        Student.prototype.saySkill = function(){
            console.log(this.skill)
        }
        var p = new Student("李四",18,"编程");
        console.log(p)
        p.sayName();
        p.saySkill()
        /* 
        类
        对象
        原型
         */
    </script>

demo2

    <script>
        function Stack(){
            this.items = [];
        }
        /* 
        入栈 push
        出栈 pop
        peek 获取栈顶
        isEmpty  判断栈是否为空
        size  可以看栈中有多少个只
         */
        Stack.prototype.push = function(val){
            this.items.push(val);
        }
        Stack.prototype.pop = function(){
            var res = this.items.pop();
            return res;
        }
        Stack.prototype.peek = function(){
            return this.items[this.items.length-1]
        }
        var s = new Stack();
        s.push(2);
        s.push(3);
        console.log(s.items);
        console.log(s.peek())
    </script>