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javascript - 为什么我收到 Unchecked runtime.lastError: The message port closed before a response 收到？

问题描述

我收到 Unchecked runtime.lastError: The message port closed before a response was received in google chrome console。

<html>
   <head>
      <title>File Uploading Form</title>
   </head>

   <body>

    <script>
        function validate(){
        var size=5242880;
        var file_size=document.getElementById('file_upload').files[0].size;
        if(file_size>=size){
            alert('Please upload file less than 5mb');
            return false;
        }

        }
    </script>
      <h3>File Upload:</h3>
      Select a file to upload: <br />
      
      <form action = "/upload" method = "POST" 
         enctype = "multipart/form-data">
         <input type="file" id="file_upload"  name="file_upload" />
         <br />
         <input type = "submit" onClick="return validate()" value = "Upload File" />
      </form>
      
   </body>
</html>

标签： javascripthtml

解决方案

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