转自：http://www.cnblogs.com/linjiqin/p/3148205.html
jQuery.ajax({
"type":"post",
"url":"http://www.baidu.com",
"success":function(rel){
if(rel.isSuccess){
window.open(rel.url,"_blank");
}
}
});
这个url请求成功后window.open(rel.url,"_blank");会被浏览器拦截，无法打开新窗口，如果把window.open()放在ajax外面，问题就迎刃而解，代码如下：
var result="";
jQuery.ajax({
"type":"post",
"url":"http://www.baidu.com",
"success":function(rel){
if(rel.isSuccess){
result=rel.url;
//window.open(rel.url,"_blank");
}
}
});
if(result.length>0){
window.open(result,"_blank");
}