打开新窗口关闭当前页面不弹出关闭提示js代码

<script type="text/javascript"> 
function closeIt() { 
window.opener = ''; 
window.open('http://www.baidu.com'); 
window.open('', '_self'); 
window.close(); 
} 
self.setInterval("newTime()", 1000) 
var t = 4; 
function newTime() { 
if (t > 0) { 
t = t - 1; 
document.getElementById("txtTime").value = t 
} 
else if (t <= 0) { 
closeIt(); 
} 
else { 
closeIt(); 
} 
} 
</script>