/**
     * 設置cookie
     * @param {string} name  鍵名
     * @param {string} value 鍵值
     * @param {integer} days cookie周期
     */
    function setCookie(name,value,days) {
        if (days) {
            var date = new Date();
            date.setTime(date.getTime()+(days*24*60*60*1000));
            
 
var expires = "; expires="+date.toGMTString();
        }else{
            var expires = "";
        }
        document.cookie = name+"="+value+expires+"; path=/";
    }
    // 獲取cookie
    function getCookie(name) {
        var nameEQ = name + "=";
        var ca = document.cookie.split(‘;‘);
        
 
for(var i=0;i < ca.length;i++) {
            var c = ca[i];
            while (c.charAt(0)==‘ ‘) c = c.substring(1,c.length);
            if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
        }
        return null;
    }
    // 刪除cookie
    function deleteCookie(name) {
        setCookie(name,
 
"",-1);
    }

js操作cookie