完成【我发起的】单据撤回功能

uas-office-web/wxuasapproval/src/pages/approval/Approval.jsx

@@ -146,6 +146,7 @@ class Approval extends Component {
   componentWillUnmount () {
     Toast.hide()
     this.moreOperation && this.moreOperation.close()
+    this.revokeAlert && this.revokeAlert.close()
   }
 
   initData = () => {
@@ -704,7 +705,7 @@ class Approval extends Component {
    * 撤回单据
    */
   revokeApproval = () => {
-    alert('提示', '单据将反提交，确认撤回？', [
+    this.revokeAlert = alert('提示', '单据将反提交，确认撤回？', [
       { text: '取消', onPress: () => {} },
       {
         text: '确定', onPress: () => {