JS之理解对象

<script>
        var person = function(name,city){
            this.name = name;
            this.city =city;   
        }
        person.prototype.showName = function(){
            return this.name;   
        }
        var p = new person(‘pmx‘,‘shanghai‘);
        console.log(p.__proto__ == person.prototype);
</script>

<script>
      var person = function(name,city){
            this.name = name;
            this.city =city;   
        }
        person.prototype.showName = function(){
            return this.name;   
        }
        var p = new person(‘pmx‘,‘shanghai‘);
        console.log(person.prototype.isPrototypeOf(p));
</script>

<script>
      var person = function(name,city){
            this.name = name;
            this.city =city;   
        }
        person.prototype.showName = function(){
            return this.name;   
        }
        var p = new person(‘pmx‘,‘shanghai‘);
        console.log(Object.getPrototypeOf(p) == person.prototype);
</script>

<script>
      var person = function(name,city){
            this.name = name;
            this.city =city;   
        }
        person.prototype.age = 26;
        person.prototype.showName = function(){
            return this.name;   
        }
        var p = new person(‘pmx‘,‘shanghai‘);
        console.log(p.hasOwnProperty("name"));
        console.log(p.hasOwnProperty("age"));
</script>

<script>
      var person = function(name,city){
            this.name = name;
            this.city =city;   
        }
        person.prototype.age = 26;
        person.prototype.showName = function(){
            return this.name;   
        }
        var p = new person(‘pmx‘,‘shanghai‘);
        console.log("name" in p);
        console.log("age" in p);
</script>