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偶然看到别人的网站背景是这样好玩的动画，就看了看源代码：如下
<!-- 背景动画 -->
<canvas id="c_n9" width="1920" height="990" style="position: fixed; top: 0px; left: 0px; z-index: -1; opacity: 0.5;"></canvas>
<script src="canvas-nest.min.js"></script>canvas-nest.min.js
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