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：

cookie

//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;

}

div{

font-size:12px;

}

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。

希望本文所述对大家JavaScript程序设计有所帮助。