<script type="text/javascript" language="javascript">
var username = null;
var password = null;
//獲取文本框  
onload = function()
{
 username = document.getElementById("txtUserName");
 password = document.getElementById("txtPassWord");   
}
//清空文本框
function clearTxt()
{
 username.value = "";
 password.value = "";
 username.focus();
 // document.getElementById('txtUserName').value="";
 // document.getElementById('txtPassWord').value="";
 // document.getElementById('txtUserName').focus();  
}
 //確定
function chkTxt()
{
 //刪除前后空格
 username.value = username.value.replace(/(^\s*)|(\s*$)/g,"");
 password.value = password.value.replace(/(^\s*)|(\s*$)/g,"");
 //判空
 if(username.value.length == 0)
 {
 alert("請輸入用戶名!");
 username.focus();
 }
 else if(password.value.length == 0)
 {
 alert("請輸入密碼!");
 password.focus();
 }
 else
 document.getElementById("btnLogin").click();
}
//回車監(jiān)聽
function onkey()
{
 if (window.event.keyCode==13)
 {
//    document.all["btnLogin"].focus();
//    if(document.activeElement.id = "aReset")
//判斷當前焦點所在的控件的id是aReset
//    {
//     document.getElementById("aReset").focus();
//    }
 document.getElementById("aLogin").focus();
 return false;
 }
}
</script>

css代碼：

<style type="text/css"> 
#btnLogin 
{ 
 width: 0px; 
 height: 0px; 
 border-style: none; 
 background-color: White; 
} 
</style>

html代碼：

<body onkeydown="onkey()">//把回車監(jiān)聽加入body 
<form id="login_form" name="login_form" runat="server"> 
 <div>
    <label>用戶：</label><input id="txtUserName" 
    runat="server" name="u_name" class="input bold" type="text"/> 
    <label>密碼：</label><input id="txtPassWord" 
    runat="server" name="u_pass" class="input" type="password"/> 
    <a href="javascript:chkTxt()" id="aLogin">確定</a> 
    <%--<a href="javascript:document.forms['login_form'].reset()">
    重置</a>--%> 
    <a href="javascript:clearTxt()" id="aReset">重置</a> 
   <asp:Button ID="btnLogin" runat="server"
   Text="" OnClick="btnLogin_Click" /> 
 </div> 
</form> 
</body>

希望本文所述對大家的javascript程序設計有所幫助。

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