javascript设置和获取cookie的方法实例详解
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
functionsetCookie(cookieName,cookieValue,cookieExpires,cookiePath)
{
cookieValue=escape(cookieValue);//编码latin-1
if(cookieExpires=="")
{
varnowDate=newDate();
nowDate.setMonth(nowDate.getMonth()+6);
cookieExpires=nowDate.toGMTString();
}
if(cookiePath!="")
{
cookiePath=";Path="+cookiePath;
}
document.cookie=cookieName+"="+cookieValue+";expires="+cookieExpires+cookiePath;
}
2.获取cookie
functiongetCookieValue(cookieName)
{
varcookieValue=document.cookie;
varcookieStartAt=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
}
returncookieValue;
}
例子：
<!doctypehtml>
<html>
<head>
<title>cookie</title>
<metacharset="utf-8">
<scriptlanguage="javascript"type="text/javascript">
//获取cookie
functiongetCookieValue(cookieName)
{
varcookieValue=document.cookie;
varcookieStartAt=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
}
returncookieValue;
}
//设置cookie
functionsetCookie(cookieName,cookieValue,cookieExpires,cookiePath)
{
cookieValue=escape(cookieValue);//编码latin-1
if(cookieExpires=="")
{
varnowDate=newDate();
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
functionwindow_onload()
{
varuserNameElem=document.getElementById("userName");//用户名输入框对象
varpasswordElem=document.getElementById("password");//密码输入框对象
varcurrUserElem=document.getElementById("currUser");//复选框对象
varcurrUser=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
functionlogin()
{
varuserNameElem=document.getElementById("userName");
varpasswordElem=document.getElementById("password");
varcurrUserElem=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
}
returnfalse;
}
if(currUserElem.checked)
{
setCookie("currUser",userNameElem.value,"","");//设置cookie
}
else
{
varnowDate=newDate();//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
}
returntrue;
}
</script>
<styletype="text/css">
div{
font-size:12px;
}
</style>
</head>
<bodyonload="window_onload()">
<div>
<formid="loginForm"onsubmit="returnlogin()">
用户名：<inputtype="text"id="userName"><br>
密码：<inputtype="password"id="password">
<inputtype="checkbox"id="currUser">记住用户名<br>
<inputtype="submit"value="登录">
</form>
</div>
</body>
</html>
注意：
由于googleChrome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。