最近在做webIM,嵌入到OA系统,由于WEBIM处在独立页面,所以如果多次点击就会出现多个页面,这样在IE6下,服务器推送会认不到页面.所以有了下面的代码:

复制代码 代码如下:

<script language="javascript" type="text/javascript">

window.onload = function () {

if (GetCookie("IsOpen") == "") {

SetCookie("IsOpen", "1");

StartService();

} else {

window.onunload = null;

window.opener = null;

window.open("", "_self");

window.close();

}

} window.onunload = function () {

if (GetCookie("IsOpen") != "")

DeleteCookie("IsOpen");

}

function GetCookieVal(offset) {

/// <summary>

/// //取得项名称为offset的cookie值

/// </summary>

/// <param name="name">Cookie名称</param>

var endstr = document.cookie.indexOf(";", offset);

if (endstr == -1)

endstr = document.cookie.length;

return unescape(document.cookie.substring(offset, endstr));

}

function GetCookie(name) {

/// <summary>

/// 根据名称获得Cookie值

/// </summary>

/// <param name="name">Cookie名称</param>

var arg = name + "=";

var alen = arg.length;

var clen = document.cookie.length;

var i = 0;

while (i < clen) {

var j = i + alen;

if (document.cookie.substring(i, j) == arg)

return GetCookieVal(j);

i = document.cookie.indexOf(" ", i) + 1;

if (i == 0) break;

}

return "";

}

function SetCookie(name, value) {

/// <summary>

/// 设置Cookie

/// </summary>

/// <param name="name">Cookie名称</param>

/// <param name="value">Cookie值</param>

var argc = SetCookie.arguments.length;

var argv = SetCookie.arguments;

var path = (argc > 3) ? argv[3] : null;

var domain = (argc > 4) ? argv[4] : null;

var secure = (argc > 5) ? argv[5] : false;

document.cookie = name + "=" + value +

((path == null) ? "" : ("; path=" + path)) +

((domain == null) ? "" : ("; domain=" + domain)) +

((secure == true) ? "; secure" : "");

}

function DeleteCookie(name) {

/// <summary>

/// 删除Cookie

/// </summary>

/// <param name="name">Cookie名称</param>

var exp = new Date();

exp.setTime(exp.getTime() - 1);

var cval = GetCookie(name);

document.cookie = name + "=" + cval + "; expires=" + exp.toGMTString();

}

</script>

把上面的代码,放到head下面就可以了.呵呵够简单了吧?当然上面的代码主要解决的是用超链接打开的页面,如果是window.open打开的页面呢,那就更简单了,代码如下:

复制代码 代码如下:

var win = null;//定义一个变量去判断就可以了

if (win == null)

{

win=window.open("Main.aspx", '', strfeatures);

}