function openWindow()
    {
        var a;
        var b;
        a=confirm("是否打开？");
        if(a==true){
            b=prompt("请输入‘确认’点击确定打开网站");
            if(b=="确认"){
            window.open('http//www.imooc.com/');
            
            
            }else{
            document.write("输入有误");
            }
        }else{
            document.write("已经取消");
        }
    }