Export and save after js modifies the contents of the json file

topic description

js modify the contents of the json file and export and save

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want to write a web page similar to online notes, the back end is not at all, just want to create a json file to record the number of people entering the page, time, and then display on the page.

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what result do you expect? What is the error message actually seen?

Operation method for js to modify json file and save it

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