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javascript设置和获取cookie的方法实例详解

  作者：bea

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(); now

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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