cookie写入，读取，删除

//写cookies 

function setCookie(name,value,Days) 
{ 

	if(Days==null){
	 var Days = 30;
	}
    
    var exp = new Date(); 
    exp.setTime(exp.getTime() + Days*24*60*60*1000); 
    document.cookie = name + "="+ escape (value) + ";expires=" + exp.toGMTString(); 
} 

//读取cookies 
function getCookie(name) 
{ 
    var arr,reg=new RegExp("(^| )"+name+"=([^;]*)(;|$)");
 
    if(arr=document.cookie.match(reg))
 
        return unescape(arr[2]); 
    else 
        return null; 
} 

//删除cookies 
function delCookie(name) 
{ 
    var exp = new Date(); 
    exp.setTime(exp.getTime() - 1); 
    var cval=getCookie(name); 
    if(cval!=null) 
        document.cookie= name + "="+cval+";expires="+exp.toGMTString(); 
} 

//Html编码获取Html转义实体
function htmlEncode(value) {
    return $('<div/>').text(value).html();
}

//Html解码获取Html实体
function htmlDecode(value) {
    return $('<div/>').html(value).text();
}