目前為止自己用過兩種方法,記下來,以免日後忘記

方法一:

<script language="javascript" type="text/javascript">
function EventEnter()
{
   key=window.event.keyCode;
 
  if(key!=13) return ;
 
  alert("開始後臺方法");
 
  document.formSubmit.submit();
}
</script>

******************************************我割***************************************************

<form id="formSubmit" runat="server">
    <div>
        <asp:TextBox ID="TextBox1" runat="server" onkeypress="javascript:return EventEnter();"></asp:TextBox>使用form.Submit的方法
        <asp:Button ID="Button1" runat="server" Text="Button" OnClick="Button1_Click" />
    </div>
    </form>

******************************************我再割**********************************************

protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            ClientScript.RegisterStartupScript(this.GetType(), "script", "<script>alert('!IsPostBack內:在後臺通過JS獲取前臺資訊:" + this.TextBox1.Text + "')</script>");
        }
        else
        {

            // document.formSubmit.submit();將獲呼叫這部分程式碼
            ClientScript.RegisterStartupScript(this.GetType(), "script", "<script>alert('!IsPostBack外:在後臺通過JS獲取前臺資訊:" + this.TextBox1.Text + "')</script>");
        }
    }

方法二:

<script type="text/javascript" language="javascript">
  function ToBehindFunction()
  {
      document.getElementById("Submit1").click();
  }
   </script>

******************************************我割***************************************************

<form id="form1" runat="server">
    <div>
        <asp:TextBox ID="TextBox1" runat="server" onblur="ToBehindFunction()"></asp:TextBox>
    <input type="submit" value="隱藏:只能通過style隱藏.不能用visible隱藏,否則JS獲取不到這個按鈕"  style=" display:none;" id="Submit1" onclick="return Submit1_onclick()" runat="server" onserverclick="Submit1_ServerClick" />
    </div>
    </form>

******************************************我再割**********************************************