javascript中cookie常用操作

Posted 2020-10-17 心向阳

//写cookies

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());

 　　}

 

//写cookies（设置作用域）

function setCookie(name,value){
var Days = 30;
var exp = new Date();
exp.setTime(exp.getTime() + Days*24*60*60*1000);
let hostname = location.hostname.substring(location.hostname.indexOf(".")+1)  //设置为一级域名
document.cookie = name + "="+ escape (value) + ";expires=" + exp.toGMTString()+";domain="+hostname+";path=/";
}

  

//读取cookies

function getCookie(name)

{

 var arr,reg=new RegExp("(^| )"+name+"=([^;]*)(;|$)");

  

 if(arr=document.cookie.match(reg))

  

  return (arr[2]);

 else

  return null;

}

 

//删除cookies

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();

}

//删除cookies（有作用域的）

function delCookie(name){

var exp = new Date();
var name = "access_token";
exp.setTime(exp.getTime() - 1);
var cval=getCookie(name);
if(cval!=null){
let hostname = location.hostname.substring(location.hostname.indexOf(".")+1)
document.cookie= name + "=‘‘;expires="+exp.toGMTString()+";domain="+hostname+";path=/";
}

} 

//使用示例

setCookie(‘username‘,‘Darren‘,30)

alert(getCookie("username"));