function openWindow(){
var mymessage=confirm("确定打开网站？");
if(mymessage==true)
window.open('//www.imooc.com/','_blank','width=400px,height=500px,menubar=no,toolbar=no');
else
window.close();
var h2=document.getElementById("con");
var div=document.getElementById("txt");
//定义"改变颜色"的函数
function gbys(){
h2.style.color='red';
div.style.backgroundColor='#ccc';
}
//定义"改变宽高"的函数
function gbkg(){
h2.style.width='100px';
div.style.height='100px';
}
}
