Open a new window and close the current page without popping up the closing prompt js code

The code is as follows:

<script type="text/javascript"> 
function closeIt() { 
window.opener = &#39;&#39;; 
window.open(&#39;http://www.baidu.com&#39;); 
window.open(&#39;&#39;, &#39;_self&#39;); 
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>

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