Demo：新建和打开按钮增加导出的提示，防止内容丢失

web/src/lang/en_us.js

@@ -277,7 +277,9 @@ export default {
     fileOpenFailed: 'File open failed',
     defaultFileName: 'Mind map',
     creatingTip: 'Creating file',
-    directory: 'Directory'
+    directory: 'Directory',
+    newFileTip: 'Please export the currently edited file before creating a new one, otherwise the content will be lost',
+    openFileTip: 'Please export the currently edited file before opening it, otherwise the content will be lost'
   },
   edit: {
     newFeatureNoticeTitle: 'New feature reminder',

web/src/lang/zh_cn.js

@@ -273,7 +273,9 @@ export default {
     fileOpenFailed: '文件打开失败',
     defaultFileName: '思维导图',
     creatingTip: '正在创建文件',
-    directory: '目录'
+    directory: '目录',
+    newFileTip: '新建文件前请先导出当前编辑的文件，否则内容会丢失',
+    openFileTip: '打开文件前请先导出当前编辑的文件，否则内容会丢'
   },
   edit: {
     newFeatureNoticeTitle: '新特性提醒',

web/src/pages/Edit/components/Toolbar.vue

@@ -30,14 +30,26 @@
           <span class="icon iconfont icondakai"></span>
           <span class="text">{{ $t('toolbar.directory') }}</span>
         </div>
-        <div class="toolbarBtn" @click="createNewLocalFile">
-          <span class="icon iconfont iconxinjian"></span>
-          <span class="text">{{ $t('toolbar.newFile') }}</span>
-        </div>
-        <div class="toolbarBtn" @click="openLocalFile">
-          <span class="icon iconfont iconwenjian1"></span>
-          <span class="text">{{ $t('toolbar.openFile') }}</span>
-        </div>
+        <el-tooltip
+          effect="dark"
+          :content="$t('toolbar.newFileTip')"
+          placement="bottom"
+        >
+          <div class="toolbarBtn" @click="createNewLocalFile">
+            <span class="icon iconfont iconxinjian"></span>
+            <span class="text">{{ $t('toolbar.newFile') }}</span>
+          </div>
+        </el-tooltip>
+        <el-tooltip
+          effect="dark"
+          :content="$t('toolbar.openFileTip')"
+          placement="bottom"
+        >
+          <div class="toolbarBtn" @click="openLocalFile">
+            <span class="icon iconfont iconwenjian1"></span>
+            <span class="text">{{ $t('toolbar.openFile') }}</span>
+          </div>
+        </el-tooltip>
         <div class="toolbarBtn" @click="saveLocalFile">
           <span class="icon iconfont iconlingcunwei"></span>
           <span class="text">{{ $t('toolbar.saveAs') }}</span>