javascript 如何在js中读取json对象
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How to read a json object in js
提问by Bhuvan
My controller has a method that is returning string representation of a jsonArray as
我的控制器有一个方法，它返回一个 jsonArray 的字符串表示为
jsonArray.toString()
jsonArray.toString()
Now following is the ajax method
现在下面是ajax方法
function loadPropertyFile(url) {
$.ajax({
type: "GET",
url: url,
dataType: "text",
success: function(response){
var obj = jQuery.parseJSON(response);
alert(obj);
}
});
}
}
Here the variable obj after parsing comes out to be
这里解析出来的变量obj是
"[{"portal.home":"Home"},{"displaytag.tracking.id":"Item ID"},{"displaytag.tracking.itemName":"Item Name"},{"displaytag.tracking.itemType":"Type"}]"
Now I want to access the values from the keys in js
现在我想从 js 中的键访问值
ie. I want to access the value of key "displaytag.tracking.id"
IE。我想访问键“displaytag.tracking.id”的值
Problem is when I am doing console.log(obj[0]["portal.home"]);It is giving me error TypeError: obj[0] is undefined
问题是当我在做console.log(obj[0]["portal.home"]); 它给了我错误TypeError: obj[0] is undefined
What shall I do ?
我该怎么办 ？
回答by VisioN
First you need to parse the JSON stringinto JavaScript object, and then access the required property:
首先需要将JSON 字符串解析为 JavaScript 对象，然后访问所需的属性：
var obj = JSON.parse(json);
console.log(obj[0]["portal.home"]);
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.
在没有原生 JSON 支持的旧浏览器中，你应该使用 Crockford 的json2.js 之类的东西，它会给你一个；请不要在 JSON 上使用 eval()，因为它可能会导致非常糟糕的事情。
回答by Matt Zeunert
Use $.parseJSON(or JSON.parse in modern browsers) to convert your string into a Javascript object:
使用$.parseJSON（或现代浏览器中的 JSON.parse）将您的字符串转换为 Javascript 对象：
var json = '[{"portal.home":"Home"},{"displaytag.tracking.id":"Item ID"},{"displaytag.tracking.itemName":"Item Name"},{"displaytag.tracking.itemType":"Type"}]';
var object = $.parseJSON(json);
In your case your JSON string will create an array, so you will need to get the object at the correct index:
在您的情况下，您的 JSON 字符串将创建一个数组，因此您需要在正确的索引处获取对象：
var portalHomeValue = object[0]["portal.home"];
回答by h2ooooooo
In case you have the JSON directly in your javascript source (which I don't assume, but I'm adding this for others), you can just remove the quotes, and javascript creates an object based on it:
如果您的 javascript 源代码中直接包含 JSON（我不假设，但我为其他人添加了这个），您可以删除引号，javascript 会基于它创建一个对象：
var obj = [{"portal.home":"Home"},{"displaytag.tracking.id":"Item ID"},{"displaytag.tracking.itemName":"Item Name"},{"displaytag.tracking.itemType":"Type"}];
console.log(obj[0]["portal.home"]);
回答by Akshay Mishra
You can directly access by following
您可以通过以下方式直接访问
var data = JSON.parse('[{"Item_Number":"M71118LHB","Description":"MENS ONESIE"}]');
var desc = data[0].Description;
console.log(desc);
