关闭当前网页和document.write()
<body>
????<script?type="text/javascript">
document.write("<h1>hello?world</h1>");
????</script>
<h1>欢迎访问V512！</h1>
<hr>
??????<input?align="center"?type="button"?value="关闭窗口"?onclick="window.close()">
</body>
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