e.KeyChar == '\r' || e.KeyChar ==

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e.KeyChar == '\r' || e.KeyChar ==
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e.KeyChar == '\r' || e.KeyChar ==
e.KeyChar == '\r' || e.KeyChar ==

e.KeyChar == '\r' || e.KeyChar ==
用户当按键盘上键的时候,会设置e.keychar.你这个代码判断用户按的是回车.