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" οnclick="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>