function openWindow(){
        var k = confirm("您确定要新窗口打开网站？");
        if(k){
            var url = 'http://www.imooc.com/';
            var p = prompt("请输入网址",url);
            if(p){
                window.open(url,'_blank','width=400,height=500,menubar=no');
            }
        }
    }