<script>
function addText()
{
var objDiv = document.getElementById("div")
var objInput = document.getElementById("loginname")
var newText = objInput.cloneNode()
objDiv.appendChild( newText )
}
</script>
<input type=button value="添加文本框" onclick="addText()">
<div id="div" style="float:left; height: 22px;">
<input id="loginname" type="text" runat="server" maxlength="10" onchange="userID()"/>
</div>
function addText()
{
var objDiv = document.getElementById("div")
var objInput = document.getElementById("loginname")
var newText = objInput.cloneNode()
objDiv.appendChild( newText )
}
</script>
<input type=button value="添加文本框" onclick="addText()">
<div id="div" style="float:left; height: 22px;">
<input id="loginname" type="text" runat="server" maxlength="10" onchange="userID()"/>
</div>
var mydiv = document.getElementById("mydiv");
mydiv.innerHTML = mydiv.innerHTML + "<input id='loginPassword' type='text' runat='server' maxlength='10' onchange='userID()'/>";
}
<script>
$=function (id){return document.getElementById(id);}
function T_j()
{
var obj=$("aaa");
var html="";
html+='<input id="loginname" type="text" runat="server" maxlength="10" onchange="userID()"/>'
+'<input id="loginPassword" type="text" runat="server" maxlength="10" onchange="userID()"/>'
obj.innerHTML=html;
}
</script>
</head>
<body>
<div style="float:left; height: 22px;" id="aaa">
<input id="loginname" type="text" runat="server" maxlength="10" onchange="userID()"/> </div>
<input type="button" value="添加文本框" onclick="T_j();"/>
</body>
</html>