解决idea光标变成黑块，切换-经验教程-爱宅域

<pre class="preclass" style="margin-top: 0px; margin-bottom: 10px; padding: 0px; box-sizing: border-box; font-family: "Source Code Pro", "DejaVu Sans Mono", "Ubuntu Mono", "Anonymous Pro", "Droid Sans Mono"; font-size: 13px; white-space: pre-wrap; line-height: 1.42857; color: rgb(51, 51, 51); overflow-wrap: break-word; border-radius: 4px; background: rgb(255, 255, 255) !important; border-width: initial !important; border-style: none !important; border-left-color: initial !important;"><p class="p1" style="margin-bottom: 16px; box-sizing: border-box; font-family: "Microsoft YaHei", "SF Pro Display", Roboto, Noto, Arial, "PingFang SC", sans-serif; font-size: 16px; color: rgb(77, 77, 77); line-height: 26px; overflow-x: auto;">光标变黑块是因为输入方式变成了改写方式，INSERT可以切换
插入/改写模式。<img src="http://wolfwl.aizhaiyu.com/1_20200815171846.png" alt="Image"></pre><pre class="preclass" style="margin-top: 0px; margin-bottom: 10px; padding: 0px; box-sizing: border-box; font-family: "Source Code Pro", "DejaVu Sans Mono", "Ubuntu Mono", "Anonymous Pro", "Droid Sans Mono"; font-size: 13px; white-space: pre-wrap; line-height: 1.42857; color: rgb(51, 51, 51); overflow-wrap: break-word; border-radius: 4px; background: rgb(255, 255, 255) !important; border-width: initial !important; border-style: none !important; border-left-color: initial !important;"><img src="http://wolfwl.aizhaiyu.com/1_20200815171921.png" alt="Image">
<p class="p1" style="margin-bottom: 16px; box-sizing: border-box; font-family: "Microsoft YaHei", "SF Pro Display", Roboto, Noto, Arial, "PingFang SC", sans-serif; font-size: 16px; color: rgb(77, 77, 77); line-height: 26px; overflow-x: auto;">插入模式：把输入的代码插到光标处，后面的向后移动。
<p class="p1" style="margin-bottom: 16px; box-sizing: border-box; font-family: "Microsoft YaHei", "SF Pro Display", Roboto, Noto, Arial, "PingFang SC", sans-serif; font-size: 16px; color: rgb(77, 77, 77); line-height: 26px; overflow-x: auto;">改写模式：是把后面的字替换新输入的。编辑代码一般是用插入模式。 
<p class="p1" style="margin-bottom: 16px; box-sizing: border-box; font-family: "Microsoft YaHei", "SF Pro Display", Roboto, Noto, Arial, "PingFang SC", sans-serif; font-size: 16px; color: rgb(77, 77, 77); line-height: 26px; overflow-x: auto;">大多笔记本上是 INS（在f12）
键(在键盘上)，外接键盘一般是右上区域的 Insert 键，Mac
电脑是 fn + Enter 组合键切换输入模式。</pre>