在web端怎么动态的添加控件
我想实现这样以个功能（类似于相册的上传功能）：当点击“上传更多”按钮时，就添加以个FileUpload控件，没有限制数量，在FileUpload控件旁边有对应的取消按钮，当点击取消时就把相应的控件删除掉，实现能在web端动态添加和删除控件的功能！~
[解决办法]
//添加附件控件function addFile(addNew){ var trAtt = document.getElementById("trAtt"); trAtt.style.display = ""; if(addNew) { var tdAttachment = document.getElementById("attachmentId"); if(tdAttachment) { var oDiv = document.createElement('div'); tdAttachment.appendChild(oDiv); var oFile = document.createElement('<input type="file" size="50" name="File" runat="server" >'); oDiv.appendChild(oFile); var oButton = document.createElement('<button onclick="removeme()">'); oButton.innerHTML = '删除'; oDiv.appendChild(oButton);// document.getElementById("appendLink").alt = '继续添加附件'; } }}//删除附件控件function removeme(){ var oDiv = event.srcElement.parentElement; if(oDiv.tagName=='DIV') { oDiv.removeNode(true); } var tdAttachment = document.getElementById("attachmentId"); window.status = tdAttachment.innerHTML; if(tdAttachment.innerHTML.length<10) {// document.getElementById("appendLink").alt = '添加附件'; var trAtt = document.getElementById("trAtt"); trAtt.style.display = "none"; }}//删除已有附件function removeAttachment(){ if(confirm("你确定要删除该附件吗?")) { var ele = event.srcElement; if(ele.attID) { //删除隐藏控件中的附件id var hfFile=document.getElementById('hfAppur'); if(hfFile) { if(hfFile.value.indexOf(ele.attID) >= 0) { hfFile.value = hfFile.value.replace(ele.attID,""); } } var trTmp = ele.parentElement; if(trTmp) trTmp.removeNode(true); var tdAttachment = document.getElementById("attachmentId"); if(tdAttachment.innerHTML.length<10) {// document.getElementById("appendLink").innerHTML = '添加附件'; var trAtt = document.getElementById("trAtt"); trAtt.style.display = "none"; } } }}