使用Node.JS中的'querystring.parse'内置模块的方法读取/解析参数

问题描述：

场景: 考虑以下代码:

var querystring = require('querystring');
var ParamsWithValue = querystring.parse(req._url.query);

然后，我就能读取任何查询字符串的值.
例如:如果请求的字符串是 http://www.website.com/Service.aspx?UID=Trans001&FacebookID=ae67ea324
我可以使用代码ParamsWithValue.UID&获取查询字符串的值. ParamsWithValue.FacebookID.

Then I am able to read any query string's value.
E.g: If requested string is http://www.website.com/Service.aspx?UID=Trans001&FacebookID=ae67ea324
I can get the values of query string with codes ParamsWithValue.UID & ParamsWithValue.FacebookID respectively.

问题:我能够获得以上述相同方式传递的任意数量的参数的值.但是第二次以后，我在浏览器中收到以下错误消息.

Issue: I am able to get the values of any number of parameters passed in the same way described above. But for second time onwards I am getting the following error in response on browser.

错误:

{"code":"InternalError","message":"Cannot read property 'query' of undefined"}

问题:从URL读取查询字符串的方法出了什么问题.

Question: What is wrong in the approach to read the query string from the URL.

注意:我不想使用任何框架来解析它.我试图仅依赖内置模块.

更新:更改任何参数的值后，它都能正确响应.但是，即使从不同的浏览器再次请求相同的值，也会引发相同的错误.

Note: I don't want to use any frameworks to parse it. I am trying to depend on built-in modules only.

Update: It responds correctly when the value of any of the parameter is changed. But if the same values requested again from even different browser it throws same error.

答

我认为您需要req.url而不是req._url.

I think you need req.url rather than req._url.

req.url是一个字符串，如果要使用URI实例，请使用require('url').parse(req.url)

req.url is a string, if you want a URI instance use require('url').parse(req.url)

所以，您最终应该拥有:

So, you should finally have:

var ParamsWithValue = querystring.parse(require('url').parse(req.url).query);

我更正了第1点的错字，即最后一个req.url->. req._url

I corrected a typo in point 1, the last req.url -> req._url

使用Node.JS中的'querystring.parse'内置模块的方法读取/解析参数

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