Chrome不支持showModalDialog模态对话框和无法返回returnValue的问题

1 var returnValue = window.showModalDialog("son.html ", window);
2 //for chrome
3 if (returnValue == undefined) {
4     returnValue = window.returnValue;
5 }

if (window.opener != undefined) {
       //for chrome
       window.opener.returnValue = "opener returnValue";
}
else {
       window.returnValue = "window returnValue";
}
window.close();