防止刷新过快

1.定义COOKIE 类

var Cookie =
{
	get : function(name) {
		var value = "";
		var arr = document.cookie.match(new RegExp("(^| )"+name+"=([^;]*)(;|$)"));
		if(arr != null) { value = unescape(arr[2]); }
		return value;
	},
	set : function(name,value,days){
		if(isNaN(days)){
			document.cookie = name+"="+escape(value)+";";
		}else{
			document.cookie = name+"="+escape(value)+";expires="+new Date(new Date().getTime()+days*86400000).toGMTString();
		}
	},
	del : function(name){
		document.cookie = name+"=;expires="+new Date().toGMTString();
	}
}

2屏蔽刷新 检测是否刷新过快

document.onkeydown = function() {  
	var k = window.event.keyCode;  
	if (k == 116 || (window.event.ctrlKey && window.event.keyCode==82)) //屏蔽   F5   刷新键  和CTRL+R
	{  
		window.event.keyCode = 0;  
		window.event.returnValue = false;  
		chkrefresh();
	} 
}
var refreshtime = 5000;//5秒
function chkrefresh()//检测是否刷新过快
{
	var oldtime = Cookie.get('refreshtime');
	var nowtime = new Date().getTime();
	oldtime = parseInt(oldtime);
	if(oldtime+refreshtime<nowtime) {
		window.location.reload();
		Cookie.set('refreshtime',nowtime);
	} else {
		alert("刷新过快，请稍候");
	}
}