is a magnifying glass. After you use style.left to indicate that left is not defined, use style.marginTop to indicate that MarginTop is not defined, and debug all the time, but you don"t know what"s wrong
./ / Please paste the code text below (do not replace the code with pictures)
see if this DOM exists.
it is very likely that the DOM object of the operation does not get a value, and it is not a matter of style
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