Example code for adding, obtaining and deleting cookies in js

The application of

cookie is very common in web pages. In this article, I will introduce how to add, get the value, and delete cookies in js. Friends who are interested should not miss it

The code is as follows:

function setCookie(name,value,time){ 
var oDate = new Date(); 
oDate.setDate(oDate.getDate()+time); 
document.cookie = name+"="+value+";expires="+oDate; 
} 


function getCookie(name){ 
var arr = document.cookie.split("; "); 
for(var i=0; i<arr.length; i++){ 
var arr2 = arr[i].split("="); 
if(arr2[0] == name){ 
return arr2[1]; 
} 
} 
return ""; 
} 


function removeCookie(name){ 
setCookie(name,"",0) 
}

JavaScript is a script that runs on the client, so it is generally not possible to set Session because Session runs on the server Endless. Cookies run on the client, so you can use JS to set cookies. Let's analyze the case

//已经验证过
// JavaScript Document
//使用说明： 
//设置缓存：setCookie("name",value);
//获取缓存：var name=getCookie("name");
//删除缓存：delCookie("name");
///设置cookie
function setCookie(NameOfCookie, value, expiredays)
{
 //@参数:三个变量用来设置新的cookie:
 //cookie的名称,存储的Cookie值,
 // 以及Cookie过期的时间.
 // 这几行是把天数转换为合法的日期
 var ExpireDate = new Date ();
 ExpireDate.setTime(ExpireDate.getTime() + (expiredays * 24 * 3600 * 1000));
 // 下面这行是用来存储cookie的,只需简单的为"document.cookie"赋值即可.
 // 注意日期通过toGMTstring()函数被转换成了GMT时间。
 document.cookie = NameOfCookie + "=" + escape(value) + ((expiredays == null) ? "" : "; expires=" + ExpireDate.toGMTString());
}
///获取cookie值
function getCookie(NameOfCookie)
{
 // 首先我们检查下cookie是否存在.
 // 如果不存在则document.cookie的长度为0
 if (document.cookie.length > 0)
 {
  // 接着我们检查下cookie的名字是否存在于document.cookie
  // 因为不止一个cookie值存储,所以即使document.cookie的长度不为0也不能保证我们想要的名字的cookie存在
  //所以我们需要这一步看看是否有我们想要的cookie
  //如果begin的变量值得到的是-1那么说明不存在
  begin = document.cookie.indexOf(NameOfCookie+"=");
  if (begin != -1)   
  {
   // 说明存在我们的cookie.
   begin += NameOfCookie.length+1;//cookie值的初始位置
   end = document.cookie.indexOf(";", begin);//结束位置
   if (end == -1) end = document.cookie.length;//没有;则end为字符串结束位置
   return unescape(document.cookie.substring(begin, end));
  }
 }
 return null;
 // cookie不存在返回null
}
///删除cookie
function delCookie (NameOfCookie)
{
 // 该函数检查下cookie是否设置，如果设置了则将过期时间调到过去的时间;
 //剩下就交给操作系统适当时间清理cookie啦
 if (getCookie(NameOfCookie))
 {
  document.cookie = NameOfCookie + "=" + "; expires=Thu, 01-Jan-70 00:00:01 GMT";
 }
}

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