修改

src/views/four/index.vue

@@ -11,7 +11,7 @@
           <a-tab-pane key="5" tab="更多+"> </a-tab-pane>
         </a-tabs>
         <div class="input_1">
-          <el-select size="large" v-model="searchValue" filterable remote reserve-keyword placeholder="请输入想要搜索的内容" :remote-method="remoteMethod" :loading="searchLoading">
+          <el-select size="large" clearable v-model="searchValue" filterable remote reserve-keyword placeholder="请输入想要搜索的内容" :remote-method="remoteMethod" :loading="searchLoading">
             <el-option v-for="item in tagsList" :key="item.id" :label="item.title" :value="item.title" />
           </el-select>
           <el-button size="large" @click="onSearch" type="primary">搜索</el-button>

src/views/search/index.vue

@@ -12,7 +12,7 @@
           <a-tab-pane key="6" tab="成果"> </a-tab-pane>
         </a-tabs>
         <div class="input_1">
-          <el-select size="large" v-model="searchValue" filterable remote reserve-keyword placeholder="请输入想要搜索的内容" :remote-method="remoteMethod" :loading="searchLoading">
+          <el-select size="large" clearable v-model="searchValue" filterable remote reserve-keyword placeholder="请输入想要搜索的内容" :remote-method="remoteMethod" :loading="searchLoading">
             <el-option v-for="item in tagsList" :key="item.id" :label="item.title" :value="item.title" />
           </el-select>
           <el-button size="large" @click="onSearch" type="primary">搜索</el-button>