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有時為了某種需要，要求進入一個頁面時彈出一個窗口．但每次進入時都會彈出，就使人感受到煩．怎樣實只彈出一次呢？下面的程序將實現瀏覽才第一次訪問這頁時彈出窗口，以后再進入則不會彈出．
在<head>…..</head>之間加入下列代碼：
<script languang="javascript">
function openpopup(){
window.open("hello.htm","","width=300,height=300") //自己修改彈出窗口
}
function get_cookie(Name) {
var search = Name + "="
var returnvalue = "";
if (document.cookie.length > 0) {
offset = document.cookie.indexOf(search)
if (offset != -1) {
// if cookie exists
offset += search.length
// set index of beginning of value
end = document.cookie.indexOf(";", offset);
// set index of end of cookie value
if (end == -1)
end = document.cookie.length;
returnvalue=unescape(document.cookie.substring(offset, end))
}
}
return returnvalue;
}
function loadpopup(){
if (get_cookie("popped")==""){
openpopup()
document.cookie="popped=yes"
}
}
</script>
將如下代碼鍵入BODY區：
<body onload="loadpopup()">
//pop when enter page
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