jquery asynchronous loop acquisition function implementation code_jquery

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jquery code:



When writing jquery code, I encountered the following problems:

(1) I did not write the third line at the beginning, but at the beginning. In line 11, $(this) is directly called, and the error "Cannot assign a value to the callback function" is reported. The reason is that the object has changed after the callback, so it needs to be saved in advance;

(2) The dataType is not written, and msg cannot be returned. I don’t know why;