7.12work/Object.html at master · lisiming228/7.12work · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script>
        // object练习
        //Object.assign()
        var obj=new Object();
        var obj1={"name":"a"};
        var obj2={
            say:function(){
                console.log("say");
            }
        };
        console.log(Object.assign(obj,obj1,obj2));
        obj.say();
        //Object.is()
        console.log(Object.is(0,-0));
        //Object.prototype.isPrototyprOf()
        function a(){}
        var b = new a();
        console.log(a.prototype.isPrototypeOf(b));
        //Object.defineProperty()
        Object.defineProperty(obj, 'age', {
            value: '19'
        })
        console.log(obj.age)
        // Object.defineProperties()
        var per = new Object();
        Object.defineProperties(per, {
            name: {
                value: 'a',
                configurable: false,
                writable: true,
                enumerable: true
            },
            age: {
                value: 18,
                configurable: true
            }
        })
        console.log(per.name,per.age);
        per.name="b";
        per.age=20;
        for(var key in per){
            console.log(per[key]);
        }
        // console.log(Object.keys(per));
        console.log(per.name, per.age) ;// 张三, 18
        //Object.freeze(obj)
        Object.freeze(per)
        per.name='b';
        per.age=23;
        console.log(per.name,per.age);
        // Object.getOwnPropertyNames(obj);
        console.log( Object.getOwnPropertyNames(per));
        //Object.getOwnPropertySymbols(obj);
        console.log(Object.getOwnPropertySymbols(per));
        // Reflect.ownKeys(obj);
        console.log( Reflect.ownKeys(per));
        //Object.values(obj)
        console.log(Object.values(per));
    </script>
</head>
<body>

</body>
</html>