JSON

一、jsonObject类型,直接看jsonArray类型

二、jsonArray类型，相对于jsonObject类型，外面需要多加一层遍历数组

　　注意下面2种获取内容的for..In循环里面的参数i和m，当时晕乎了，请教了人才明白

1>获取到json中的属性名称

var aData=[
            {width:'20px',height:'20px',left:'40px',top:'50px',background:'#f00'},
            {width:'30px',height:'30px',left:'20px',top:'20px',background:'#ccc'}
        ];

        for(var i in aData) {
            for (var m in aData[i]) {
                console.log(m)
            }
        }

 

输出结果为

2>获取到json中的属性值

var aData=[
            {width:'20px',height:'20px',left:'40px',top:'50px',background:'#f00'},
            {width:'30px',height:'30px',left:'20px',top:'20px',background:'#ccc'}
        ];
        for(var i in aData){
            for(var m in aData[i]){
                console.log(aData[i][m])
            }
        }

 

 输出结果为

3>获取到json中所有特定属性的属性值，比如我获取到每一个的属性名为 高度 的属性值

var aData=[
            {width:'20px',height:'20px',left:'40px',top:'50px',background:'#f00'},
            {width:'30px',height:'30px',left:'20px',top:'20px',background:'#ccc'}
        ];
        for(var i in aData) {
            console.log(aData[i].height)
        }

 

输出结果为

3>复杂json

var aData = {
            "china":{
                "hangzhou":{"item1":"1"},
                "shanghai":{"item2":"2"},
                "chengdu":{"item3":"3"}
            },
            "America":{
                "aa":{"item1":"1"},
                "bb":{"item2":"2"}
            },
            "Spain":{
                "dd":{"item1":"1"},
                "ee":{"item2":"2"},
                "ff":{"item3":"3"}
            }
        };
        for(var country in aData){
            document.write(country+''+''+'<br>');
            for(var city in aData[country]){
                document.write(city+'>'+'')
                for(var attr in aData[country][city]){
                    document.write(attr+':'+'')
                }
                for(var value in aData[country][city][attr]){
                    //document.write(value+''+'<br>')-->这样写不正确，因为value并不是对象，只是值而已
                    document.write(aData[country][city][attr][value]+''+'<br>')
                }
            }
        }

 

 

输出结果为

 

var aData = {
            "china":[
                {"name":"hangzhou", "item":"1"},
                {"name":"shanghai", "item":"2"},
                {"name":"sichuan", "item":"3"}
            ],
            "America":[
                {"name":"aa", "item":"12"},
                {"name":"bb", "item":"2"}
            ],
            "Spain":[
                {"name":"cc", "item":"1"},
                {"name":"dd", "item":"23"},
                {"name":"ee", "item":"3"}
            ]
        }
        for(var country in aData){
            document.write(country+''+''+'<br>')
            for(var cityObj in aData[country] ){//遍历jsonArray
                for(var cityName in aData[country][cityObj]) {
                    document.write(cityName + '>')//输出属性名
                    for (var cityItem in aData[country][cityObj][cityName]) {
                        document.write(aData[country][cityObj][cityName][cityItem])//输出属性值
                    }
                }
            }
        }