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  • json的格式,对象导航

    json有两种格式:

    1)对象格式:{"key1":obj,"key2":obj,"key3":obj...}

    2)数组/集合格式:[obj,obj,obj...]

     

    例如:user对象 用json数据格式表示

    {"username":"zhangsan","age":28,"password":"123","addr":"北京"}

     

    <script language="JavaScript">

      var person = {"firstname":"张","lastname":"三丰","age":100};

      //取出lastname
      alert(person.lastname);
      //取出age
      alert(person.age);

    </script>

     

    List<Product> 用json数据格式表示

    [{"pid":"10","pname":"小米4C"},{},{}]

     

    <script language="JavaScript">
      * 案例二
      * [{key:value,key:value},{key:value,key:value}]

      var persons = [
      {"firstname":"张","lastname":"三丰","age":100},
      {"firstname":"李","lastname":"四","age":25}
      ];

      //取出 firstname=李
      alert(persons[1].firstname);
      //取100
      alert(persons[0].age);
    </script>

     

    注意:对象格式和数组格式可以互相嵌套

    <script language="JavaScript">
    * 案例三
    * {
    * "param":[{key:value,key:value},{key:value,key:value}]
    * }

    var json = {
      "baobao":[
        {"name":"小双","age":28,"addr":"扬州"},
        {"name":"建宁","age":18,"addr":"紫禁城"},
        {"name":"阿珂","age":10,"addr":"山西"},
      ]
    };

    //取name = 建宁
    alert(json.baobao[1].name);

    //取addr 山西
    alert(json.baobao[2].addr);

    </script>

    注意:json的key是字符串  jaon的value是Object

     

    json的解析:

    json是js的原生内容,也就意味着js可以直接取出json对象中的数据

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  • 原文地址:https://www.cnblogs.com/Allen-Wei/p/8994815.html
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