JavaScript JSON语法

Posted 2020-09-27 15037075275z

1.创建JSON

JSON数距的是以键值对存储。

语法：

var JSOM名 ={"name":"张三","sex":"女","age":19};

var JSOM名 ={"student":[{"name":"张三","sex":"男","age":18},{"name":"李四","sex":"女","age":19},{"name":"王五","sex":"女","age":19}]};

var JSOM名 ={"student":{"name":"张三","sex":"男","age":18}};

2.调用JSON

(1)

var JSOM名 ={"name":"张三","sex":"女","age":19};

调用：alert(JSOM名.name);

(2)

var JSOM名 ={"student":[{"name":"张三","sex":"男","age":18},{"name":"李四","sex":"女","age":19},{"name":"王五","sex":"女","age":19}]};

调用：

var arr = JSOM名.student;
for(i=0;i<arr.length;i++)
{
alert(arr[i].age+arr[i].name+arr[i].sex)
}

(3)

var JSOM名 ={"student":{"name":"张三","sex":"男","age":18}};

调用：

alert(JSOM名.student.name);