javascript点击按钮，增加文本框

html与css

<div style="width:300px; height:400px; clear:both" id="Content"></div><input type="button" value="添加" onclick="addBotton()" />

script<script type="text/javascript">    var cont = document.getElementById("Content")    var i = 1;    function addBotton(){        var NewInput = document.createElement("input");        NewInput.setAttribute("size",20);        NewInput.setAttribute("type","text");        NewInput.setAttribute("name","new" + i);        cont.appendChild(NewInput);        i++;    }</script>