⑴ CAJ格式的文件怎么打开
caj格式的文件需要CAJViewer软件才能打开，直接下载安装一个CAJViewer软件，就可以将文件打开了。方法如下：
1、在浏览器搜索框输入CAJViewer，然后点击中国知网的这一个搜索结果。
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2、进入中国知网之后，将CAJViewer下载到电脑上。
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3、然后找到刚刚下载的文件，双击将文件进行安装。
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4、安装成功之后点击完成就可以了。
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5、然后找到需要打开的caj格式的文件，直接将它打开即可。
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注意事项：
caj格式的文件一般是学术类的文件，可以直接在中国知网下载此软件。
⑵ 怎样全选复制微信全部聊天记录
1、按其中一条聊天记录，然后选择【更多】
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2、选择你想要收藏或者保存的聊天记录，状态是方框打钩即可。
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3、如果要保存到笔记中，那么点击第四个按钮。
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4、
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4、完成以上步骤后，打开云笔记，粘贴进去，保存即可。
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5、返回微信聊天界面，返回之前，可以把邮件删掉即可。
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