Node.js：无法提取查询字符串值

Question

With node.js

Code:

 var querystring = require('querystring');
 ...
 console.log("Incoming: ", event);
 var output = querystring.parse(event);
 console.log("Key 1 value is: ", output.key1);

Output:

Incoming:  { key3: 'value 3', key2: 'value 2', key1: 'value 3' }
Key 1 value is:  undefined

Why is the Key1 value printed as undefined (although incoming event is printed correctly just before that)?

Answer 1

Your event object isn't a querystring, so there isn't anything to parse in this case.

querystring is for parsing raw HTTP query strings:

var qs = require('querystring');
var parsed = qs.parse("key1=value3&key2=value2&key3=value1");
// { key1: 'value3', key2: 'value2', key3: 'value1' }