lovecoding
/
vipAllDay


			
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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>
</head>
<body>
    <!-- 
        JSON: JavaScript Object Natation
                js对象    表示  数据结构
     -->
     <script>
        // js对象
        var obj = {
            name:"Lucy",
            age: 19
        }
        // json对象
        /***
         * var 声明对象
         * var obj = "{'属性名':'属性值'}"
         * 注意：单引包双引  
         */
        var obj1 = "{'name':'LiLi'}";
        // console.log(obj);
        // console.log(obj1);
        var arr = [
            {id:1,name:"孙悟空"},
            {id:2,name:"猪八戒"},
            {id:3,name:"哪吒"}
        ]
        console.log(arr,'arr');
        var arr1 = '[{"id":"1","name":"孙悟空"},{"id":"2","name":"猪八戒"},{"id":"3","name":"哪吒"}]'
        console.log(arr1,'arr1');
        // js转json JSON.stringify
        var arr2 = JSON.stringify(arr);
        console.log(arr2,'arr2');
        // json转js JSON.parse
        var arr3 = JSON.parse(arr2);
        console.log(arr3,'arr3')
        var arr4 = JSON.parse(arr1);
        console.log(arr4,'arr4');

        /**
         * 堆：引用数据类型
         * 栈：基本数据类型 引用数据类型的指针
         * 深浅拷贝：
        */
       var obj3 = {
        name:"12"
       }
       obj4 = obj3;
       obj3 = JSON.stringify(obj3)
       var obj4;
       obj4.name = '21';
    //    obj4 = {
    //     name:"21"
    //    }
        // obj4 = JSON.stringify(obj4);
        // obj4 = '{"name":"10"}'
       console.log(obj4,'obj4');
       console.log(obj3,'obj3');


       var obj2;
       obj2 = obj;
       console.log(obj2);
    //    深拷贝：一个对象复制另一个对象的内容 修改当前对象  原对象不发生改变
        // obj2 = '{"name":"小明","age":"22"}'
    //    浅拷贝：一个对象复制另一个对象的内容 修改当前对象  原对象发生改变;
        // obj2.name ='画画';
        obj2 = {
            name:"哈哈",
            age: 10
        }
        console.log(obj2,'obj2');
       console.log(obj,'obj')


     </script>

</body>
</html>