WEB前端实例，JS实现拖拽效果~
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<html lang="en">
<head>
<meta charset="UTF-8">
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<title>Document</title>
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width: 200px;
height: 200px;
background-color: red;
border-radius: 15px;
box-shadow: 10px 10px 10px rgba(0, 0, 0, 0.7);
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top: 300px;
left: 1000px;
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