javascript设置和获取cookie的方法实例详解

2019-11-20 10:51:32

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本文实例讲述了javascript设置和获取cookie的方法。分享给大家供大家参考，具体如下：

1. 设置cookie

function setCookie(cookieName,cookieValue,cookieExpires,cookiePath){  cookieValue = escape(cookieValue);//编码latin-1  if(cookieExpires=="")  {    var nowDate = new Date();    nowDate.setMonth(nowDate.getMonth()+6);    cookieExpires = nowDate.toGMTString();  }  if(cookiePath!="")  {    cookiePath = ";Path="+cookiePath;  }  document.cookie= cookieName+"="+cookieValue+";expires="+cookieExpires+cookiePath;}

2. 获取cookie

function getCookieValue(cookieName){  var cookieValue = document.cookie;  var cookieStartAt = cookieValue.indexOf(""+cookieName+"=");  if(cookieStartAt==-1)  {    cookieStartAt = cookieValue.indexOf(cookieName+"=");  }  if(cookieStartAt==-1)  {    cookieValue = null;  }  else  {    cookieStartAt = cookieValue.indexOf("=",cookieStartAt)+1;    cookieEndAt = cookieValue.indexOf(";",cookieStartAt);    if(cookieEndAt==-1)    {      cookieEndAt = cookieValue.length;    }    cookieValue = unescape(cookieValue.substring(cookieStartAt,cookieEndAt));//解码latin-1  }  return cookieValue;}

例子：

<!doctype html><html><head><title>cookie</title><meta charset="utf-8"><script language="javascript" type="text/javascript">  //获取cookie   function getCookieValue(cookieName)  {    var cookieValue = document.cookie;    var cookieStartAt = cookieValue.indexOf(""+cookieName+"=");    if(cookieStartAt==-1)    {      cookieStartAt = cookieValue.indexOf(cookieName+"=");    }    if(cookieStartAt==-1)    {      cookieValue = null;    }    else    {      cookieStartAt = cookieValue.indexOf("=",cookieStartAt)+1;      cookieEndAt = cookieValue.indexOf(";",cookieStartAt);      if(cookieEndAt==-1)      {        cookieEndAt = cookieValue.length;      }      cookieValue = unescape(cookieValue.substring(cookieStartAt,cookieEndAt));//解码latin-1    }    return cookieValue;  }  //设置cookie  function setCookie(cookieName,cookieValue,cookieExpires,cookiePath)  {    cookieValue = escape(cookieValue);//编码latin-1    if(cookieExpires=="")    {      var nowDate = new Date();      nowDate.setMonth(nowDate.getMonth()+6);      cookieExpires = nowDate.toGMTString();    }    if(cookiePath!="")    {      cookiePath = ";Path="+cookiePath;    }    document.cookie= cookieName+"="+cookieValue+";expires="+cookieExpires+cookiePath;  }  //页面加载时间处理函数  function window_onload()  {    var userNameElem = document.getElementById("userName");//用户名输入框对象    var passwordElem = document.getElementById("password");//密码输入框对象    var currUserElem = document.getElementById("currUser");//复选框对象    var currUser = getCookieValue("currUser");    if(currUser!=null)    {      userNameElem.value=currUser;      currUserElem.checked = true;    }    if(userNameElem.value!="")    {      passwordElem.focus();//密码输入框获得焦点    }    else    {      currUserElem.focus();//用户名输入框获得焦点    }  }  //表单提交处理  function login()  {    var userNameElem = document.getElementById("userName");    var passwordElem = document.getElementById("password");    var currUserElem = document.getElementById("currUser");    if(userNameElem.value=="" || passwordElem.value=="")    {      alert("用户名或密码不能为空！");      if(userNameElem.value=="")      {        userNameElem.focus();//用户名输入框获得焦点      }      else      {        passwordElem.focus();//密码输入框获得焦点      }      return false;    }    if(currUserElem.checked)    {      setCookie("currUser",userNameElem.value,"","");//设置cookie    }    else    {      var nowDate = new Date();//当前日期      nowDate.setMonth(nowDate.getMonth()-2);//将cookie的过期时间设置为之前的某个日期      cookieExpires = nowDate.toGMTString();//过期时间的格式必须是GMT日期的格式      setCookie("userName","",cookieExpires,"");//删除一个cookie只要将过期时间设置为过去的一个时间即可    }    return true;  }</script><style type="text/css">  div{    font-size:12px;  }</style></head><body onload="window_onload()"><div><form id="loginForm" onsubmit="return login()">用户名：<input type="text" id="userName"><br>密 码：<input type="password" id="password"><input type="checkbox" id="currUser">记住用户名<br><input type="submit" value="登录"></form></div></body></html>

注意：

由于google Chrome浏览器为了安全只支持online-cookie,所以在本地测试时是没有效果的，需要上传到服务器试一下。

更多关于JavaScript操作cookie相关内容可查看本站专题：《JavaScript 操作 cookie相关知识汇总》及《jQuery的cookie操作技巧总结》

希望本文所述对大家JavaScript程序设计有所帮助。

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