for help (open) : taroReact WeChat authorization code cannot get, routing address bar directly modify address, or enter directly access, an error: 404 interface

Use: the framework of taroReact,,
WeChat web development,
Problem:
1, WeChat authorization code cannot get,
2, the routing address bar directly modify address, or enter directly access, an error: 404 interface

Problem description:
1, WeChat authorization code cannot get


Normal process, given by WeChat extracted WeChat web page code, used to get the user's information,
Front end to provide the corresponding to the back-end data: appid, scope, redirect_uri, then access this url, Mosaic of front page to get after with the code on the address bar, used for subsequent operations,
Problems: visit after joining together the address bar doesn't come with code, but we in the Network:

Or Sources:
Can see already has the form of code, but it?? How to get? Or what is the situation,


2, the routing address bar directly modify address, or enter directly access, an error: 404 interface
Is this web page,
When we enter
Web page address can show:
http://demo.fjclound.cn
And can be attached at the back on
http://demo.fjclound.cn/pages/index/index


But in time directly enter the or input address:
http://demo.fjclound.cn/pages/index/index
There will be 404 interface error,




Want to ask this kind of condition, please you have met, or met, or know some situation, the problems under the below message, really thank you!