●●JAVA漂浮的問题？●●

Question

如何將下面的代碼改成能固定在窗口的左边，可以隨着窗口的的向下拉，向上拉，始終固定在窗口的左边可以看到的。這代碼是网上抄的，我自己是不会JAVA的，所以看不懂，如果有人可以帮我一步一步的在旁注明这步是干什么的，那步是干什么的，將会感激不尽！希望能找到有心人帮我个忙，謝了！<!-- 左隐藏菜单开始 -->
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Answer 1

昏,
没听过java漂浮,想学习一下
居然是js