弹出对话框的页面A：
<script type="text/javascript">
function openDialog(){
paramers="dialogWidth:500px; dialogHeight:300px; status:no";
workerId = window.showModalDialog("userList.aspx","",paramers);
if(workerId!=undefined && workerId!=""){
document.getElementById("leader").value = workerId;
}
}
</script>
模式对话框js：
<input type="button" value="选择" onclick="javascript:selectPositionAndClose();"/>
</form>
<script type="text/javascript">
function selectPositionAndClose(){
var obj = document.getElementById("userList");
var user = "";
for(var i=0;i<obj.options.length;i++){
if(obj.options[i].selected==true){
user = obj.options[i].value;
}
}
window.returnValue = user;
window.close();
}
</script>