//封装获取cookie

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

 

　　

//封装设置cookie

function setCookie (c_name, value, expiredays) { var exdate = new Date(); exdate.setDate(exdate.getDate() + expiredays); document.cookie = c_name + "=" + escape(value) + ((expiredays == null) ? "" : ";expires=" + exdate.toGMTString());};

 

//封装删除cookie 

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();};