原文地址：http://blog.csdn.net/feilonglulu/article/details/8026038
父页面：
function openwindows(){
var obj = new Object();
var retval = window.showModalDialog("ordervideo.jsp?rderIds="+"0010,0020,0030",obj,"dialogWidth=500px;dialogHeight=500px");
//for chrome
if(retval == undefined) {
retval = window.returnValue;
}
alert(retval);
}
子页面：
function onload(){
//for chrome
if(window.opener != undefined) {
window.opener.returnValue = flag;
} else {
window.returnValue=flag;
}
window.close();
}