function openWindow(){
        var isOpen=confirm("是否打开新窗口？？");
        if(isOpen==true){
            var openAdd=prompt("请输入你要打开的网址","http://www.imooc.com");
            document.write("你输入的是："+openAdd);
            window.open(openAdd,'_blank','width=400,height=500,left=0')
        }else{
        document.write("你选择了不打开窗口，已关闭");
        }
    }