小程序怎么全站变黑白？

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小程序怎么全站变黑白？Why does the applet become black and white throughout the site?

page {  filter: grayscale(100%);}

On the mourning day of April 4, the boss asked the app to turn black and white. It's easy to go black and white app.wxss In a line of CSS to get, but control on and off the line is very troublesome! Page {filter: grayscale (100%);} if the code is changed manually, the client can not be guaranteed to update and recover on time. Want to put on the server control, but can not write dynamically app.wxss , one by one page access workload is very big, also not very realistic. Do you have any good ideas or plans?

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