JavaScript：json对象简单操作

js之json对象简单操作

1.声明json对象

var idCard &＃61; {"no":"920766616","nation":"汉"};
var person &＃61; {"name":"张三","age":23,"isStu":true,"id":idCard};


2.获取对象属性

//获取对象里的属性
console.log("获取age属性的值&＃xff1a;" &＃43; person.age);
console.log("获取age属性的值&＃xff1a;" &＃43; person["age"]);


打开浏览器&＃xff0c;按f12查看控制台console

3.循环获取json对象

//循环json对象for(var i in person){console.log(i &＃43; ":" &＃43; person[i]);}//结果是i为键值//将json放入数组中
var person2 &＃61; [{"no":"920766616","nation":"汉"},{"name":"张三","age":23,"isStu":true}];//遍历数组&＃xff08;这里相当于二维数组&＃xff09; for(var i in person2){//这里i为下标索引值for(var j in person2[i]){console.log(person2[i][j]);}}

控制台显示&＃xff1a;

4.字符串转换为json格式

//把字符串转换为json对象var str &＃61; &＃39;{"no":"920766616","nation":"汉"}&＃39;;var newStr &＃61; JSON.parse(str);console.log(newStr);

控制台显示&＃xff1a;

5.json对象定义属性和方法

var jsonStr &＃61; {"name" : "fjh",add : function(a,b){return a * b;}};console.log(jsonStr.add(1,2));

控制台显示&＃xff1a;