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jQuery with QQ customer service drop-down return to top code

The jQuery code with QQ customer service drop-down and return to the top is a web page with two buttons on the right side, one is the online QQ customer service button, and the other is the return to the top button, which can only be displayed when the page is pulled down.

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Code introduction: jQuery with QQ customer service drop-down return to the top code is a web page with two buttons on the right side, one is the online QQ customer service button, and the other is the return to the top button, which can only be displayed when the page is pulled down.

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