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並前往https://www.developerdrive.com/using-jquery-to-add-a-dynamic-back-to-top-floating-button-with-smooth-scroll/

Using jQuery to add a dynamic “Back To Top” floating button ...

ready(function() { var offset = 220; var duration = 500; jQuery(window).scroll(function() { if (jQuery(this).scrollTop() > offset) { jQuery ...

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