JS操作Cookie写入和读取的简便方法（一看就懂，直接能用！）！

写入cookie实例！

 var u = "value=123";  document.cookie = u;

读取cookie实例,读取value的值！

var c_name="value"; // 变量名   if (document.cookie.length > 0) {        c_start = document.cookie.indexOf(c_name + "=")        if (c_start != -1) {            c_start = c_start + c_name.length + 1            c_end = document.cookie.indexOf(";", c_start)            if (c_end == -1) c_end = document.cookie.length            //        document.write(document.cookie.substring(c_start,c_end)+"<br>");            var sss= unescape(document.cookie.substring(c_start, c_end))  // 取出值            alert(sss)        }    }