毕设任务提交作品页面同一个学生上传文件时不能上传同名文件，新建和编辑页面都需要做处理

public/react/src/modules/courses/busyWork/CommonWorkPost.js

@@ -293,9 +293,11 @@ class CommonWorkPost extends Component{
   }
   // 附件相关 START
   handleChange = (info) => {
-    let fileList = info.fileList;
+    if (info.file.status === 'uploading') {
+      let fileList = info.fileList;
 
-    this.setState({ fileList: appendFileSizeToUploadFileAll(fileList) });
+      this.setState({ fileList: appendFileSizeToUploadFileAll(fileList) });
+    }
   }
 
   onAttachmentRemove = (file) => {
@@ -587,6 +589,18 @@ render(){
     onChange: this.handleChange,
     onRemove: this.onAttachmentRemove,
     beforeUpload: (file) => {
+      // TODO 文件存在则提示并退出
+      let gotSameFile = false;
+      this.state.fileList && this.state.fileList.some((item) => {
+        if (item.name && item.name.startsWith(file.name)) {
+          gotSameFile = true;
+          return true
+        }
+      })
+      if (gotSameFile) {
+        this.props.showNotification("该附件已被上传！")
+        return false
+      }
       console.log('beforeUpload', file.name);
       const isLt150M = file.size / 1024 / 1024 < 150;
       if (!isLt150M) {