Onload executes only once
SetData stores data in the page cache
if the data is undefined, you may need that = this. After the curly braces, the of these changes
e in the event function is an event, which refers to the event of this operation
options are objects.
If it is written like this, an error will be reported: syntax error: unexpected end of JSON input
At this time, do not use the arrow function!
So there is no error!
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