JavaScript把信息存入cookie

    <script>
            var CookieUtil = {// 设置cookie
                set: function(name, value, expires, domain, path, secure) {    
                    var cookieText = "";    
                    cookieText += encodeURIComponent(name) + "=" + encodeURIComponent(value);    
                    if(expires instanceof Date) {      
                        cookieText += "; expires=" + expires.toGMTString();    
                    }    
                    if(path) {      
                        cookieText += "; path=" + path;    
                    }    
                    if(domain) {      
                        cookieText += "; domain=" + domain;    
                    }    
                    if(secure) {      
                        cookieText += "; secure";    
                    }    
                    document.cookie = cookieText;  
                },
                   // name=value; expires=expiration_time; path=domain_path; domain=domain_name; secure
                   // 获取cookie
                  get: function(name) {    
                    var cookieName = encodeURIComponent(name) + "=",
                              cookieStart = document.cookie.indexOf(cookieName),
                              cookieValue = "";    
                    if(cookieStart > -1) {      
                        var cookieEnd = document.cookie.indexOf(";", cookieStart);      
                        if(cookieEnd == -1) {        
                            cookieEnd = document.cookie.length;      
                        }      
                        cookieValue = decodeURIComponent(document.cookie.substring(cookieStart + cookieName.length, cookieEnd));    
                    }    
                    return cookieValue;  
                },
                   // 删除cookie
                  unset: function(name, domain, path, secure) {    
                    this.set(name, "", Date(0), domain, path, secure);  
                }
            };
            // 测试
            CookieUtil.set("name", "zhang");
            var name = CookieUtil.get("name");
            alert(name);  // zhang
            //CookieUtil.unset("name");
            alert(CookieUtil.get("name")); // 空
        </script>