Js添加、读取、删除cookie，判断cookie是否有效，指定domain域下主路径path下设置cookie，设置expires过期时间…

 a=getCookie("username3");
 c_start=document.cookie.indexOf("username3="); if(c_start == -1){ $("#login_form").show(); $("#logined").hide(); } else{ $("#login_form").hide(); $("#logined").show(); $("#ustr").html(a); }

//写入cookie到主域，设置过期时间为一年 function SetCookie(name, value) { console.log(name, value) var str = name + "=" + escape(value) + ";domain=.cnblogs.com;path=/"; var date = new Date(); date.setTime(date.getTime() + 365 * 24 * 60 * 60 * 1000); //设置date为当前时间加一年  str += ";expires=" + date.toGMTString(); console.log(str) document.cookie = str; }

 //获得coolie 的值 function cookie(name){ var cookieArray=document.cookie.split("; "); //得到分割的cookie名值对 var cookie=new Object(); for (var i=0;i<cookieArray.length;i++){ var arr=cookieArray[i].split("="); //将名和值分开 if(arr[0]==name)return unescape(arr[1]); //如果是指定的cookie，则返回它的值  } return ""; } 

//删除cookie function delCookie(name) { document.cookie = name+"=;expires="+(new Date(0)).toGMTString(); }

//获取指定名称的cookie的值 function getCookie(objName){ var arrStr = document.cookie.split("; "); for(var i = 0;i < arrStr.length;i ++){ var temp = arrStr[i].split("="); if(temp[0] == objName) return unescape(temp[1]); } }

//添加cookie function addCookie(objName,objValue,objHours){ var str = objName + "=" + escape(objValue); if(objHours > 0){ //为时不设定过期时间，浏览器关闭时cookie自动消失 var date = new Date(); var ms = objHours*3600*1000; date.setTime(date.getTime() + ms); str += "; expires=" + date.toGMTString(); } document.cookie = str; }

//两个参数，一个是cookie的名子，一个是值 function SetCookie(name,value) { var Days = 30; //此 cookie 将被保存 30 天 var exp = new Date(); //new Date("December 31, 9998"); exp.setTime(exp.getTime() + Days*24*60*60*1000); document.cookie = name + "="+ escape (value) + ";expires=" + exp.toGMTString(); }

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

//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(); }