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别问我为什么直接拿去用
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<title>Document</title>
<script src="https://cdn.bootcss.com/jquery/3.2.1/jquery.js"></script>
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<body >
<div style="height: 50vh;width: 100%;border: 1px solid #ccc"></div>
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</body>
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window.addEventListener('scroll', function () {
if(window.pageYOffset + window.innerHeight >= document.documentElement.scrollHeight){
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