js 对象创建 

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>

    </style>
</head>

<body>
    <div class="container">
    </div>
    <script>
        //js对象创建 
        //方法1 {}、属性和方法键值对 用逗号分开 
        var person = {
                name: "李卫国",
                age: 12,
                getm: function() {
                    console.log(3333333)
                }
            }
            //方法2 new Object()
        var obj = new Object()
        obj.name = "张三"
        obj.say = function() {
                console.log('obj say')
            }
            //方法3 构造函数
        function Person(name, age) {
            this.name = name;
            this.age = age;
            this.sing = function(song) {
                console.log(this.name + " sing" + song)
            }
        }
        //js对象使用 属性调用:对象名.属性名 对象名['属性名'] 方法调用：对象名.方法名()
        // console.log(person.name)
        // console.log(person['name'])
        // person.getm()
        // console.log(obj.name)
        // obj.say()
        var zxy = new Person("张学友", 40)
            //zxy.sing('一千个伤心的理由')
            // for in 循环对象
        for (let k in zxy) {
            console.log(k) //属性k
            console.log(zxy[k])
        }
        //
        var myMath = {
            pi: Math.PI,
            max: function() {
                var max = arguments[0]
                for (var i = 1; i < arguments.length; i++) {
                    if (arguments[i] > max) {
                        max = arguments[i]
                    }
                }
                return max
            },
            min: function() {
                var min = arguments[0]
                for (var i = 1; i < arguments.length; i++) {
                    if (arguments[i] < min) {
                        min = arguments[i]
                    }
                }
                return min
            }
        }
        console.log(myMath.pi)
        console.log(myMath.max(23, 12, -12, 32, -43, 32))
        console.log(myMath.min(23, 12, -12, 32, -43, 32))
    </script>
</body>

</html>

　　

posted @ 2020-05-07 18:06  howhy  阅读(91)  评论(0)    收藏  举报