把警示窗改为显示在页面右上角，显示几秒后会自动关闭。用鼠标点按信息窗口会立即关闭，并把内容拷贝到系统剪贴板。
This script displays non-blocking alert messages at the top right corner of page. Each message appears for seconds and then disappears automatically. Click on a message box will close it immediately and copy the message to clipboard.
Demo: https://jsfiddle.net/qjkgxoab/
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