一 、頁面 級回車：
<script language="javascript" type="text/javascript">
function document.onkeydown()
{
var e=event.srcElement;
if(event.keyCode==13)
{
document.getElementById("Button1").click();
return false;
}
}
</script>
<script language="javascript">
function document.onkeydown()
{
var e=event.srcElement;
if(event.keyCode==13)
{
document.getElementById("你按紐的ID").click();
return false;
}
}
</script>
二、針對某個控件的（例如文本框）的回車
test.aspx
<asp:TextBox id="TextBox1" style="Z-INDEX: 101; LEFT: 384px; POSITION: absolute; TOP: 288px"
runat="server"></asp:TextBox>
<asp:Button id="Button1" style="Z-INDEX: 102; LEFT: 464px; POSITION: absolute; TOP: 88px" runat="server"
Text="Button"></asp:Button>
<asp:Label id="Label1" style="Z-INDEX: 103; LEFT: 80px; POSITION: absolute; TOP: 208px" runat="server"
Width="656px">調用服務器端代碼必須調用__doPostBack函數，但該函數除了在放置有DataGrid控件的頁面中會由系統產生外，其他的頁面中並不存在</asp:Label>
<input type="hidden" name="__EVENTTARGET"> <input type="hidden" name="__EVENTARGUMENT">
客戶端腳本：
<script language="javascript" event="onkeydown" for="TextBox1">
if(event.keyCode == 13){
__doPostBack('Button1','');
event.keyCode=0; <!--很重要，不然會選擇Button1進行提交 -->
return false;<!--很重要，不然會選擇Button1進行提交 -->
}
</script>
<script language="javascript" type="text/javascript">
<!--
function __doPostBack(eventTarget, eventArgument) {
var theform;
if (window.navigator.appName.toLowerCase().indexOf("microsoft") > -1) {
theform = document.Form1;
}
else {
theform = document.forms["Form1"];
}
theform.__EVENTTARGET.value = eventTarget.split("$").join(":");
theform.__EVENTARGUMENT.value = eventArgument;
theform.submit();
}
// -->
</script>
test.cs代碼：
private void Button1_Click(object sender, System.EventArgs e)
{
this.Label1.Text ="回車事件測試成功！";
}
<script language="javascript" type="text/javascript"> function document.onkeydown() { var e=event.srcElement; if(event.keyCode==13) { document.getElementById("Button1").click(); return false; } } </script>