太难了。
<head>
<meta charset="UTF-8">
<title>Document</title>
<style type="text/css">
@import "../css/day0408.css";
</style>
</head>
<body>
<input id="appinput" type="text" value="123456789asdfcvxc678">
<textarea id="app">123456789asdfcvxc6789asdfcvxc
12345
123456789asdfcvxc</textarea>
</body>
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