这个你搞错了!
改为这样吧：
document.getElementById("button3").onclick=function (){
window.location=你的URL
}
<html><head>
<title>Untitled Document</title>
<meta http-equiv="Content-Type" content="text/html charset=gb2312">
<script language="javascript">
LastTableID = 0
function add() {
LastTableID = LastTableID + 1
adTable = document.getElementById('atb_' + LastTableID)
if (adTable != null) {
adTable.style.display = "block"
}
else {
str = '<table id="atb_' + LastTableID + '" style="display:block">'
str = str + '<tr height="25" align=center valign=middle bgcolor=#FFFFFF>'
str = str + '<td><input type="text" name="input1_' + LastTableID + '"></td>'
str = str + '<td>--></td>'
str = str + '<td><input type="text" name="input2_' + LastTableID + '"></td>'
str = str + '<td>的距离是：</td>'
str = str + '<td><input type="text" name="input3_' + LastTableID + '"></td>'
str = str + '</tr></table>'
window.upid.innerHTML += str + ''
}
}
function dellast() {
//alert(LastTableID)
if (LastTableID >0) {
deleTable = document.getElementById('atb_' + LastTableID)
if (deleTable != null) {
deleTable.style.display = "none"
LastTableID = LastTableID - 1
}
}
}
</script>
</head>
<body>
<form name="myform">
<table>
<tr>
<td>
<input name="Submit2" type="button" onclick="javascript:add()" value="增加">
<input type="button" name="del" onclick="javascript:dellast()" value="删除">
</td>
</tr>
<tr>
<td>
<div id="upid"></div>
</td>
</tr>
</table>
</form>
</body>
</html>
<script type="text/javascript">function selectthis(obj){
var content=document.getElementById("content")
if(obj.checked){
var btnjian=document.createElement("input")
btnjian.type="button"
btnjian.value="-"
btnjian.setAttribute("fid",obj.id)
btnjian.onclick=function(){
var fdiv=document.getElementById("f"+this.getAttribute("fid"))
var fnum=fdiv.getElementsByTagName("input")[0]
if(fnum.value>1)fnum.value-=1
}
var btnjia=document.createElement("input")
btnjia.type="button"
btnjia.value="+"
btnjia.setAttribute("fid",obj.id)
btnjia.onclick=function(){
var fdiv=document.getElementById("f"+this.getAttribute("fid"))
var fnum=fdiv.getElementsByTagName("input")[0]
fnum.value=parseInt(fnum.value)+1
}
var num=document.createElement("input")
num.type="text"
num.value=1
var foodname=document.createTextNode(obj.value)
var box=document.createElement("div")
box.id="f"+obj.id
box.appendChild(foodname)
box.appendChild(num)
box.appendChild(btnjia)
box.appendChild(btnjian)
content.appendChild(box)
}else{
var box=document.getElementById("f"+obj.id)
content.removeChild(box)
}
}
</script>
<div id="select">
种类：<br/>
<input id="f1" type="checkbox" value="馒头" onClick="selectthis(this)" name="items">馒头<br/>
<input id="f2" type="checkbox" value="油饼" onClick="selectthis(this)" name="items">油饼<br/>
<input id="f3" type="checkbox" value="油条" onClick="selectthis(this)" name="items">油条<br/>
</div>
已选：
<div id="content"></div>
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