【JSON入门学习总结】

<script>
    //定义基本的格式
    var person={"name":"张三","age":23,"gender":true};
    //alert(person);

    //获取name的值
   // var name=person.name;
    var name=person["name"];
    //alert(name);


    //嵌套格式1  { }-->[]
    var persons={
        "persons":[
            {"name":"张三","age":23,"gender":true},
            {"name":"李四","age":23,"gender":true},
            {"name":"王五","age":23,"gender":true}
            ]
    };
    //alert(persons);
    //获取王五
    var name1 = persons.persons[2].name;
    //alert(name1)
    //嵌套格式2 []-->{ }
    var ps=[{"name":"张三","age":23,"gender":true},
        {"name":"李四","age":23,"gender":true},
        {"name":"王五","age":23,"gender":true}];
    //alert(ps);
    //获取李四
    alert(ps[1].name);
</script>

<script>
    //定义基本的格式
    var person={"name":"张三","age":23,"gender":true};
    //获取person对象中所有键和值
    //for in  key是变量是每一个键的名称
    for (var key in person){
        //person.key获取出来相当于person."name"
        //alert(key+":"+person.key);
        //alert(key+":"+person[key]);
    }

    var ps=[{"name":"张三","age":23,"gender":true},
        {"name":"李四","age":23,"gender":true},
        {"name":"王五","age":23,"gender":true}];
    //获取ps中的而所有值
    for (var i=0;i<ps.length;i++){
        var p=ps[i];//得到的是对象
        for (var key in p){
            alert(key+":"+p[key]);
        }
    }

</script>