Javascript 提取json数据
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extracting json data
提问by Paul
I have some json from a remote server and the results are returned like this:
我有一些来自远程服务器的 json，结果是这样返回的：
[{"item1":"tag1","a1":"b1"},{"item2":"tag2","a2":"b2"}]
How would I get the value of a1 and a2?
我如何获得 a1 和 a2 的值？
Thanks
谢谢
回答by Matt Ball
Use JSON.parse()if the data is still in string form:
使用JSON.parse()如果数据仍然是字符串形式：
var rawData = '[{"item1":"tag1","a1":"b1"},{"item2":"tag2","a2":"b2"}]';
var parsed = JSON.parse(rawData);
console.log(parsed[0].a1); // logs "b1"
console.log(parsed[1].a2); // logs "b2"
Demo: http://jsfiddle.net/mattball/WK9gz/
演示：http: //jsfiddle.net/mattball/WK9gz/
Since you're using jQuery, swap out $.get()for $.getJSON()and jQuery will automagically parse the JSON for you. Inside of the successcallback, you'll have a normal JavaScript object to work with — no parsing required.
由于您使用的是 jQuery，换掉$.get()for $.getJSON()，jQuery 会自动为您解析 JSON。在success回调内部，您将有一个普通的 JavaScript 对象可以使用——不需要解析。
$.getJSON('http://example.com/foo/bar/baz', function (data)
{
console.log(data[0].a1); // logs "b1"
console.log(data[1].a2); // logs "b2"
});
