设置一个cookie记录刷新次数,写一个checkreload函数,若刷新次数已经达到限制,返回false,不然返回true并将cookie+1.
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<SCRIPT LANGUAGE="JavaScript1.1">// The constructor function: creates a cookie object for the specified
// document, with a specified name and optional attributes.
// Arguments:
// document: The Document object that the cookie is stored for. Required.
// name: A string that specifies a name for the cookie. Required.
// hours: An optional number that specifies the number of hours from now
// that the cookie should expire.
// path: An optional string that specifies the cookie path attribute.
// domain: An optional string that specifies the cookie domain attribute.
// secure: An optional Boolean value that, if true, requests a secure cookie.
//
function Cookie(document, name, hours, path, domain, secure)
{
// All the predefined properties of this object begin with '$'
// to distinguish them from other properties which are the values to
// be stored in the cookie.
this.$document = document;
this.$name = name;
if (hours)
this.$expiration = new Date((new Date()).getTime() + hours*3600000);
else this.$expiration = null;
if (path) this.$path = path; else this.$path = null;
if (domain) this.$domain = domain; else this.$domain = null;
if (secure) this.$secure = true; else this.$secure = false;
}// This function is the store() method of the Cookie object.
function _Cookie_store()
{
// First, loop through the properties of the Cookie object and
// put together the value of the cookie. Since cookies use the
// equals sign and semicolons as separators, we'll use colons
// and ampersands for the individual state variables we store
// within a single cookie value. Note that we escape the value
// of each state variable, in case it contains punctuation or other
// illegal characters.
var cookieval = "";
for(var prop in this) {
// Ignore properties with names that begin with '$' and also methods.
if ((prop.charAt(0) == '$') || ((typeof this[prop]) == 'function'))
continue;
if (cookieval != "") cookieval += '&';
cookieval += prop + ':' + escape(this[prop]);
} // Now that we have the value of the cookie, put together the
// complete cookie string, which includes the name and the various
// attributes specified when the Cookie object was created.
var cookie = this.$name + '=' + cookieval;
if (this.$expiration)
cookie += '; expires=' + this.$expiration.toGMTString();
if (this.$path) cookie += '; path=' + this.$path;
if (this.$domain) cookie += '; domain=' + this.$domain;
if (this.$secure) cookie += '; secure'; // Now store the cookie by setting the magic Document.cookie property.
this.$document.cookie = cookie;
}
// This function is the load() method of the Cookie object.
function _Cookie_load()
{
// First, get a list of all cookies that pertain to this document.
// We do this by reading the magic Document.cookie property.
var allcookies = this.$document.cookie;
if (allcookies == "") return false; // Now extract just the named cookie from that list.
var start = allcookies.indexOf(this.$name + '=');
if (start == -1) return false; // Cookie not defined for this page.
start += this.$name.length + 1; // Skip name and equals sign.
var end = allcookies.indexOf(';', start);
if (end == -1) end = allcookies.length;
var cookieval = allcookies.substring(start, end); // Now that we've extracted the value of the named cookie, we've
// got to break that value down into individual state variable
// names and values. The name/value pairs are separated from each
// other by ampersands, and the individual names and values are
// separated from each other by colons. We use the split method
// to parse everything.
var a = cookieval.split('&'); // Break it into array of name/value pairs.
for(var i=0; i < a.length; i++) // Break each pair into an array.
a[i] = a[i].split(':'); // Now that we've parsed the cookie value, set all the names and values
// of the state variables in this Cookie object. Note that we unescape()
// the property value, because we called escape() when we stored it.
for(var i = 0; i < a.length; i++) {
this[a[i][0]] = unescape(a[i][1]);
} // We're done, so return the success code.
return true;
}// This function is the remove() method of the Cookie object.
function _Cookie_remove()
{
var cookie;
cookie = this.$name + '=';
if (this.$path) cookie += '; path=' + this.$path;
if (this.$domain) cookie += '; domain=' + this.$domain;
cookie += '; expires=Fri, 02-Jan-1970 00:00:00 GMT'; this.$document.cookie = cookie;
}// Create a dummy Cookie object, so we can use the prototype object to make
// the functions above into methods.
new Cookie();
Cookie.prototype.store = _Cookie_store;
Cookie.prototype.load = _Cookie_load;
Cookie.prototype.remove = _Cookie_remove;//===================================================================
// The code above is the definition of the Cookie class.
// The code below is a sample use of that class.
//===================================================================// Create the cookie we'll use to save state for this web page.
// Since we're using the default path, this cookie will be accessible
// to all web pages in the same directory as this file or "below" it.
// Therefore, it should have a name that is unique among those pages.
// Note that we set the expiration to 10 days in the future.
var visitordata = new Cookie(document, "name_color_count_state", 240);// First, try to read data stored in the cookie. If the cookie is not
// defined, or if it doesn't contain the data we need, then query the
// user for that data.
if (!visitordata.load() || !visitordata.name || !visitordata.color) {
visitordata.name = prompt("What is your name:", "");
visitordata.color = prompt("What is your favorite color:", "");
}// Keep track of how many times this user has visited the page:
if (visitordata.visits == null) visitordata.visits = 0;
visitordata.visits++;// Store the cookie values, even if they were already stored, so that the
// expiration date will be reset to 10 days from this most recent visit.
// Also, store them again to save the updated visits state variable.
visitordata.store();// Now we can use the state variables we read:
document.write('<FONT SIZE=7 COLOR="' + visitordata.color + '">' +
'Welcome, ' + visitordata.name + '!' +
'</FONT>' +
'<P>You have visited ' + visitordata.visits + ' times.');
</SCRIPT><FORM>
<INPUT TYPE="button" VALUE="Forget My Name" onClick="visitordata.remove();">
</FORM>
<!-- //定时刷新页面!
var limit="0:2" //在此处a时间段
var parselimit=limit.split(":")
parselimit=parselimit[0]*60+parselimit[1]*1
function beginrefresh(){
if(parselimit==1)
window.location.reload()
else{
parselimit-=1
min=Math.floor(parselimit/60)
sec=parselimit%60
if(min!=0)
msg=min+"分"+sec+"秒后重新刷新页面!"
else
msg=sec+"秒后重新刷新页面!"
window.status=msg
setTimeout("beginrefresh()",1000) //在此处设置刷新频率(a时间段内刷新N次)
}
}
window.onload=beginrefresh
//-->
</script>