JSON Chrome扩展问题 [英] JSON Chrome Extension Problem

问题描述

我正在创建一个谷歌浏览器扩展程序作为一个项目，并且遇到了障碍。我正在玩JSON（希望最终使用我喜欢的API）。我有一个示例JSON文件，加载它，获取存储解析JSON的变量（我可以看到它作为一个对象，包含对象和值），但是，我不知道如何引用其中的对象的值。

I am creating a google chrome extension as a project and have run into a hurdle. I am playing around with JSON (hoping to eventually use an API i like). I have an example JSON file, load it, get a variable storing the parsed JSON (which I can see as an object, containing objects and values), however, I don't know how to reference values of the objects within.

var xhr = new XMLHttpRequest();
var resp;
xhr.open("GET", "eg.json", true);
xhr.onreadystatechange = function() {
  if (xhr.readyState == 4) {
    resp = JSON.parse(xhr.responseText);
  }
}
xhr.send();

对象resp看起来像这个发送后执行。

The object resp looks like this after send is executed.

我想这是因为我是新的到JavaScript，但我怎么会得到createdDate作为一个字符串变量？

I guess this is because I'm new to JavaScript but how would I get the createdDate as a String variable?

谢谢

Thanks

推荐答案

您可以通过点或< （或更多的动态属性）符号（或两者的组合） ）像任何其他嵌套对象。例如，根据您发布的图片，它会是：

You can access it via dot or bracket (more for dynamic properties) notation (or a mix of both) like any other nested objects. For example, based on the image you posted it would be:

var createdDate = resp.WhoisRecord.audit.createdDate;

请注意，如果需要在 >其中定义了 resp ，只有在该回调中才会填充它......如果您尝试并在 之后使用 xhr.onreadystatechange = function hookup，它在运行时不会准备好，在 readySTate == 4 ，它应该是。

Note you need to call this inside that if where resp is defined, only in that callback will it be populated...if you try and use it after your xhr.onreadystatechange = function hookup, it won't be ready when it runs, inside that callback with a readyState == 4, it should be.

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