如何在js中读取json对象 [英] How to read a json object in js

问题描述

我的控制器有一个方法将jsonArray的字符串表示形式返回为

My controller has a method that is returning string representation of a jsonArray as

jsonArray.toString()

jsonArray.toString()

现在是ajax方法

function loadPropertyFile(url) {
$.ajax({
    type: "GET",
    url: url, 
    dataType: "text",
    success: function(response){
        var obj = jQuery.parseJSON(response);
        alert(obj);
    }
});

}

解析后的变量obj是

"[{"portal.home":"Home"},{"displaytag.tracking.id":"Item ID"},{"displaytag.tracking.itemName":"Item Name"},{"displaytag.tracking.itemType":"Type"}]"

现在我想从js中的键访问值

Now I want to access the values from the keys in js

即.我想访问键"displaytag.tracking.id"的值

ie. I want to access the value of key "displaytag.tracking.id"

问题是我在执行 console.log(obj [0] ["portal.home"]); 时出现错误 TypeError:obj [0]未定义

Problem is when I am doing console.log(obj[0]["portal.home"]); It is giving me error TypeError: obj[0] is undefined

我该怎么办?

推荐答案

首先，您需要将 JSON字符串解析为JavaScript对象，然后访问所需的属性:

First you need to parse the JSON string into JavaScript object, and then access the required property:

var obj = JSON.parse(json);
console.log(obj[0]["portal.home"]);

在不支持本地JSON的旧版浏览器中，应使用Crockford的 json2.js ，这会给你一个；请不要在JSON上使用eval()，因为它可能导致周围情况非常糟糕.

In older browsers which do not have native JSON support, you should use something like Crockford's json2.js, which will give you one; please don't use eval() on JSON, as it can lead to pretty bad things all around.

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