<form id="form1" runat="server">??? <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>??? <script id="scr1" type ="text/javascript" >??????? function getValue() {??????????? var x = document.getElementById("TextBox1");??????????? //alert(x.getAttribute("Text"))??????????? alert(x.)??????? }??? </script> ??? <input id="Button1" type="button" value="button"? onclick ="getValue()" />??? </form> 這段代碼的返回值總是 “null”，不禁要問(wèn)，JavaScript可以訪問(wèn)服務(wù)器端控件嗎？