input 上传文件的判断

    
        'utf-8'>
         "viewport" content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
         
    
        
"upload.html" method="post" enctype="multipart/form-data" accept-charset="utf-8">
            "file" type="file" name="选择文件">

            "fileUpload" type="submit" value="提交">
        
        

    

空文件就不要让提交

转载于:https://www.cnblogs.com/agansj/p/10876985.html