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。
希望本文所述对大家JavaScript程序设计有所帮助。