SOURCE

//检验弹窗是否被浏览器内置屏蔽
var wroxWin = window.open("http://www.baidu.com","_blank");
	if(wroxWin == null){
		alert("弹窗已经被浏览器屏蔽");
	}

//监测弹窗是否被浏览器内置的屏蔽
var blocked = false;
try {
var wroxWin = window.open("http://www.wrox.com", "_blank");
if (wroxWin == null){
blocked = true;
}
} catch (ex){
blocked = true;
}
if (blocked){
alert("弹窗已经被浏览器屏蔽");
}