如何通过js 获取json数据

JavaScript017

如何通过js 获取json数据,第1张

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js 中读取JSON的方法探讨

js读取JSON的方法我接触到的有两种：

方法一：函数构造定义法返回

var strJSON = "{name:'json name'}"//得到的JSON

var obj = new Function("return" + strJSON)()//转换后的JSON对象

alert(obj.name)//json name

方法二：js中著名的eval函数

var strJSON = "{name:'json name'}"//得到的JSON

var obj = eval( "(" + strJSON + ")" )//转换后的JSON对象

alert(obj.name)//json name

第二种方法需要注意的是，对象表达式{'name':'json name'}必须用“（）”扩住，否则

var strJSON = "{name:'json name'}"

var obj = eval(strJSON)

alert(obj.constructor)//String 构造函数

alert(obj.name)//undefine

必须把对象表达式扩起来eval执行才能生成一个匿名对象!

通过循环就可以将json里的值全部获取了；

var json = {'name':'xxxxx', 'age':27}

for(var name in json){

document.write(json[name])

}

var json = { contry:{ area:{ man:"12万", women:"10万" } } }

//方式一：使用eval解析

var obj = eval(json)

alert(obj.constructor)

alert(obj.contry.area.women)

//方式二：使用Funtion函数

var strJSON = "{name:'json name'}"//得到的JSON

var obj = new Function("return" + strJSON)()//转换后的JSON对象

alert(obj.name)//json name

alert(obj.constructor)

//复杂一点的json数组数据的解析

var value1 = [{"c01":"1","c02":"2","c03":"3","c04":"4","c05":"5","c06":"6","c07":"7","c08":"8","c09":"9"}, {"c01":"2","c02":"4","c03":"5","c04":"2","c05":"8","c06":"11","c07":"21","c08":"1","c09":"12"}, {"c01":"5","c02":"1","c03":"4","c04":"11","c05":"9","c06":"8","c07":"1","c08":"8","c09":"2"}] var obj1 = eval(value1)

alert(obj1[0].c01)

//复杂一点的json的另一种形式

var value2 = {"list":[ {"password":"1230","username":"coolcooldool"}, {"password":"thisis2","username":"okokok"}], "array":[{"password":"1230","username":"coolcooldool"},{"password":"thisis2","username":"okokok"}]}

var obj2 = eval(value2)

alert(obj2.list[0].password)