Popup弹出新页面并含有返回值

var url = "<%=request.getContextPath()%>/test.do";
var style = "left=200px;top=120px;dialogWidth=540px;dialogHeight=708px;help:no;status:no;scroll:no;resize:no;center:yes;";
var returnValue = window.showModalDialog(url,window, style);

window.returnValue = returnValue;