完成卡分配赛选框的点击清空

back-ui/src/views/dz/cards/components/AssignCardDialog.vue

@@ -20,6 +20,7 @@
           v-model="form.cardType"
           placeholder="请选择卡类型"
           style="width: 100%"
+          clearable
         >
           <el-option
             v-for="dict in cardTypeOptions"
@@ -57,6 +58,7 @@
           v-model="form.agentId"
           placeholder="请选择代理商"
           style="width: 100%"
+          clearable
         >
           <el-option
             v-for="agent in agentList"
@@ -73,6 +75,7 @@
           v-model="form.province"
           placeholder="请选择省份"
           style="width: 100%"
+          clearable
         >
           <el-option
             v-for="province in provinceList"
@@ -90,6 +93,7 @@
           placeholder="请选择学校"
           style="width: 100%"
           :disabled="!form.province"
+          clearable
         >
           <el-option
             v-for="school in schoolList"
@@ -106,6 +110,7 @@
           v-model="form.studentCategory"
           placeholder="请选择考生类别"
           style="width: 100%"
+          clearable
         >
           <el-option label="全部" value="all"></el-option>
           <el-option