主页上做了一个弹出窗口，如何使其只弹出一次，返回主页时不再弹出了。
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1<script>
2window.open("http://www.yeboss.com.cn","yeboss","width=300,height=400")
3</script>
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cookie
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1<head>
2<script language="JavaScript">
3
4<!-- Begin
5var expDays = 1; // number of days the cookie should last
6
7var page = "only-popup-once.html";
8var windowprops = "width=300,height=200,location=no,toolbar=no,menubar=no,scrollbars=no,resizable=yes";
9
10function GetCookie (name) {
11var arg = name + "=";
12var alen = arg.length;
13var clen = document.cookie.length;
14var i = 0;
15while (i < clen) {
16var j = i + alen;
17if (document.cookie.substring(i, j) == arg)
18return getCookieVal (j);
19i = document.cookie.indexOf(" ", i) + 1;
20if (i == 0) break;
21}
22return null;
23}
24function SetCookie (name, value) {
25var argv = SetCookie.arguments;
26var argc = SetCookie.arguments.length;
27var expires = (argc > 2) ? argv[2] : null;
28var path = (argc > 3) ? argv[3] : null;
29var domain = (argc > 4) ? argv[4] : null;
30var secure = (argc > 5) ? argv[5] : false;
31document.cookie = name + "=" + escape (value) +
32((expires == null) ? "" : ("; expires=" + expires.toGMTString())) +
33((path == null) ? "" : ("; path=" + path)) +
34((domain == null) ? "" : ("; domain=" + domain)) +
35((secure == true) ? "; secure" : "");
36}
37function DeleteCookie (name) {
38var exp = new Date();
39exp.setTime (exp.getTime() - 1);
40var cval = GetCookie (name);
41document.cookie = name + "=" + cval + "; expires=" + exp.toGMTString();
42}
43var exp = new Date();
44exp.setTime(exp.getTime() + (expDays*24*60*60*1000));
45function amt(){
46var count = GetCookie('count')
47if(count == null) {
48SetCookie('count','1')
49return 1
50}
51else {
52var newcount = parseInt(count) + 1;
53DeleteCookie('count')
54SetCookie('count',newcount,exp)
55return count
56}
57}
58function getCookieVal(offset) {
59var endstr = document.cookie.indexOf (";", offset);
60if (endstr == -1)
61endstr = document.cookie.length;
62return unescape(document.cookie.substring(offset, endstr));
63}
64
65function checkCount() {
66var count = GetCookie('count');
67if (count == null) {
68count=1;
69SetCookie('count', count, exp);
70
71window.open(page, "", windowprops);
72
73}
74else {
75count++;
76SetCookie('count', count, exp);
77}
78}
79// End -->
80</script>
81<body onload="checkCount()">
82
83\---------------------------------------------------------------
84
85用cookie！！
86程序上面已给出了！！</body></head>