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更新：

我有一个 Counter.aspx.cs

    private int counter = 0;
    protected void Page_Load(object sender, EventArgs e)
    {
        while (true)
        {
            counter++;
            Response.Write(counter+"<br>");
            Response.Flush();

            System.Threading.Thread.Sleep(1000);
            if (counter == 10)
                break;
        }

        Response.Write("End");
    }

还有一个 Index.aspx

<script language="javascript">
      function getData() {         
          var url = "Counter.aspx"; 
          loadXMLDoc(url);
      }
      var req = false;

      function createRequest() {
          // branch for native XMLHttpRequest object        
          if (window.XMLHttpRequest && !(window.ActiveXObject)) {
              try {
                  req = new XMLHttpRequest();
              } catch (e) {
                  req = false;
              } // branch for IE/Windows ActiveX version        
          } else if (window.ActiveXObject) {
              try {
                  req = new ActiveXObject("Msxml2.XMLHTTP");
              } catch (e) {
                  try {
                      req = new ActiveXObject("Microsoft.XMLHTTP");
                  } catch (e) {
                      req = false;
                  }
              }
          }
      }

      function loadXMLDoc(url) {
          try {
              if (req) {
                  req.abort();
                  req = false;
              }

              createRequest();

              if (req) {
                  req.onreadystatechange = processReqChange;
                  req.open("GET", url, true);
                  req.send("");
              } else {
                  alert('unable to create request');
              }
          } catch (e) {
              alert(e.message);
          }
      }

      function processReqChange() {
          if (req.readyState == 3) {
              try {
                  ProcessInput(req.responseText);                                                         
                  if (req.responseText.length > 3000) {                          
                      getData();
                  }
              } catch (e) {
                  alert(e.message);
              }
          }
      }

      var lastDelimiterPosition = -1;

      function ProcessInput(input) {
          var outputZone = document.getElementById("outputZone");
          outputZone.innerHTML = input;
      }
</script>

    <body>    
        <input type="button" value="Start" onclick="javascript: getData()"/>      
        <span id="outputZone"></span>
    </body>

因此，我打开两个具有相同 URL ~/Index.aspx 的浏览器并同时单击两个浏览器上的开始按钮，我首先单击“开始”的浏览器将开始计数 1... 10 结束。然后只有在第一个浏览器完成计数后，第二个浏览器才开始计数 1... 10 结束。有没有办法让两个浏览器同时开始计数？

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