javascript - 如何从 rails @variable 访问 JSON？

Question

在 Rails 中，我调用了一个返回 JSON 的 API：

{"observations":{"realtime_start":"2012-12-27","realtime_end":"2012-12-27","observation_start":"1776-07-04","observation_end":"9999-12-31","units":"pca","output_type":"1","file_type":"xml","order_by":"observation_date","sort_order":"asc","count":"263","offset":"0","limit":"100000","observation":[{"realtime_start":"2012-12-27","realtime_end":"2012-12-27","date":"1947-01-01","value":"."},{"realtime_start":"2012-12-27","realtime_end":"2012-12-27","date":"1947-04-01","value":"-0.60853"}

在控制器中，我将 JSON 传递给实例变量：

# Send the http request
response = Net::HTTP.get_response(uri)


# captures the http response
test = response.body

#converts the http response hash from xml to json
show_info = Hash.from_xml(test).to_json
@it = show_info

最后，我在视图中渲染出实例变量：

<script>
x = "<%= @it %>"
</script>

如果我在控制台中输入 x enter，json 会弹出格式有点不同，这可能是我的问题..

 "{"observations":{"realtime_start":"2012-12-27","realtime_end":"2012-12-27","observation_start":"1776-07-04","observation_end":"9999-12-31","units":"pca","output_type":"1","file_type":"xml","order_by":"observation_date","sort_order":"asc","count":"263","offset":"0","limit":"100000","observation":[{"realtime_start":"2012-12-27","realtime_end":"2012-12-27","date":"2010-10-01","value":"2.39307"},{"realtime_start":"2012-12-27","realtime_end":"2012-12-27","date":"2011-01-01","value":"0.07892"},{"realtime_start":"2012-12-27","realtime_end":"2012-12-27","date":"2011-04-01","value":"2.47721"},{"realtime_start":"2012-12-27","realtime_end":"2012-12-27","date":"2011-07-01","value":"1.27864"},{"realtime_start":"2012-12-27","realtime_end":"2012-12-27","date":"2011-10-01","value":"4.09234"},{"realtime_start":"2012-12-27","realtime_end":"2012-12-27","date":"2012-01-01","value":"1.96053"},{"realtime_start":"2012-12-27","realtime_end":"2012-12-27","date":"2012-04-01","value":"1.25266"},{"realtime_start":"2012-12-27","realtime_end":"2012-12-27","date":"2012-07-01","value":"3.10599"}]}}"

我的问题是如何访问其中一个键值对？我需要用javascript解析它吗？有没有办法通过点符号来做到这一点？

Answer 1

我隐约记得以前做过类似的事情。问题是我从 Web 服务获取 json 字符串，然后在其上调用 .to_json 。

尝试改变这个：

Hash.from_xml(test).to_json

对此：

Hash.from_xml(test)

如果这不起作用，我认为其他帖子应该可以帮助您正确格式化 json： Rails 中的 Weird JSON Javascript problem

Answer 2

JavaScript 中的 JSON 只是一个常规对象，仅此而已。所以你只需要不带引号传递它，就像这样：

<script>
x = <%= @it %>;
</script>

之后，在 javascript 中，您x将只是一个对象，您将能够访问其中的任何信息