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只弹出一次的窗口

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function openwin(){  
window.open("pop1.html","","width=120,height=240")  
}  
function get_cookie(Name) {  
var search = Name + "="  
var returnvalue = "";  
if (document.cookie.length > 0) {  
offset = document.cookie.indexOf(search)  
if (offset != -1) {  
offset += search.length  
end = document.cookie.indexOf(";", offset);  
if (end == -1)  
end = document.cookie.length;  
returnvalue=unescape(document.cookie.substring(offset, end))  
}  
}  
return returnvalue;  
}  
function loadpopup(){ //*控制弹出窗口的函数哟，你要使用他的啊  
if (get_cookie(‘popped’)==”){  
openwin()  
document.cookie="popped=yes"  
}  
}

FROM:http://www.cnblogs.com/edsky/articles/363086.html

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