JS函数08 

<!DOCTYPE html>
<html>
    <head>
        <meta charset="utf-8">
        <title></title>
    </head>
    <body>
    <script type="text/javascript">
        var person={
            username:'king',
            age:12,
            salary:1234.56,
            addr:'北京',
            sex:'男',
        };
        //查询属性，对象.属性名/对象["属性名"]
        //console.log('用户名为：'+person.username+"\n"+'性别:'+person.sex);
        //console.log('薪水：'+person['salary']+'\n'+'地址：'+person["addr"]);
        //如果属性不确定需要使用[]
        var key='username';
        //console.log(person.key);
        //console.log(person[key]);
        //console.log(person['key']);
        function PersonInfo(name,age,sex){
            this.name=name;
            this.age=age;
            this.sex=sex;
        }
        var person1=new PersonInfo('king',34,'男');
        //console.log(person1.name+person['sex']);
        
        //添加属性
        var obj={};//空对象
        obj.username='king';
        obj.age=12;
        obj.addr='北京';
        obj['test']='this is a test';
        //console.log(obj.username+'\n'+obj.age+'\n'+obj.addr+'\n'+obj['test']);
        
        //修改指定属性
        obj.username='queen';
        obj['test']='ymt';
        //console.log('修改之后的名字'+obj.username);
        //console.log(obj['test']);
        
        //通过delete删除指定属性
        delete obj['test'];
        //console.log(obj['test']);
        delete obj.username;
        //console.log(obj['username']);
        
        //通过for/in遍历属性
        
        var obj1={
            x:1,
            y:2,
            test:'this is a test',
            edu:'ymt'
        };
        for(var p in obj1){
            //console.log(p+'\n');
        }
        
        //对象中有方法
        var obj2={
            username:'king',
            age:12,
            addr:'北京',
            sayHi:function (){
                return 'say Hi';
            },
            info:function(){
                return '用户名：'+this.username+'\n'+'年龄：'+this.age+'\n地址：'+this.addr;
            }
        };
        //console.log(obj2.sayHi());
        //console.log(obj2.info());
        //console.log(obj2.info);
        
        function Person(username,age,sex,addr){
            this.username=username;
            this.age=age;
            this.sex=sex;
            this.addr=addr;
            this.info=function(){
                return this.username+this.addr;
            }
        }
        var p1=new Person('queen',34,'女','上海');
        //console.log(p1.info());
        p1.test='this is a test';
        //console.log(p1.test);
        p1.info1=function(){
            return 'this is a test1111';
        };
        console.log(p1.info1());、    
    </script>
    </body>
</html>

 

posted @ 2018-08-28 16:30  冯志国  阅读(109)  评论(0)    收藏  举报