JavaScript callback function is used in WeChat applet (picture)

This article mainly introduces the relevant information on using javascript callback function in the WeChat applet. Friends who need it can refer to it

Using javascript callback function in WeChat mini program

Principle of callback function:

I will set off now and notify you when I arrive."

This is An asynchronous process, during the process of "I go" (function execution), "you" can do anything, "when it arrives" (function execution is completed) and "notify you" (callback), the subsequent process

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