本文實例講述了javascript設置和獲取cookie的方法。分享給大家供大家參考，具體如下：
1. 設置cookie
function setCookie(cookieName,cookieValue,cookieExpires,cookiePath){ cookieValue = escape(cookieValue);//編碼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. 獲取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));//解碼latin-1 } return cookieValue;} 例子：
<!doctype html><html><head><title>cookie</title><meta charset="utf-8"><script language="javascript" type="text/javascript"> //獲取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));//解碼latin-1 } return cookieValue; } //設置cookie function setCookie(cookieName,cookieValue,cookieExpires,cookiePath) { cookieValue = escape(cookieValue);//編碼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; } //頁面加載時間處理函數 function window_onload() { var userNameElem = document.getElementById("userName");//用戶名輸入框對象 var passwordElem = document.getElementById("password");//密碼輸入框對象 var currUserElem = document.getElementById("currUser");//復選框對象 var currUser = getCookieValue("currUser"); if(currUser!=null) { userNameElem.value=currUser; currUserElem.checked = true; } if(userNameElem.value!="") { passwordElem.focus();//密碼輸入框獲得焦點 } else { currUserElem.focus();//用戶名輸入框獲得焦點 } } //表單提交處理 function login() { var userNameElem = document.getElementById("userName"); var passwordElem = document.getElementById("password"); var currUserElem = document.getElementById("currUser"); if(userNameElem.value=="" || passwordElem.value=="") { alert("用戶名或密碼不能為空！"); if(userNameElem.value=="") { userNameElem.focus();//用戶名輸入框獲得焦點 } else { passwordElem.focus();//密碼輸入框獲得焦點 } return false; } if(currUserElem.checked) { setCookie("currUser",userNameElem.value,"","");//設置cookie } else { var nowDate = new Date();//當前日期 nowDate.setMonth(nowDate.getMonth()-2);//將cookie的過期時間設置為之前的某個日期 cookieExpires = nowDate.toGMTString();//過期時間的格式必須是GMT日期的格式 setCookie("userName","",cookieExpires,"");//刪除一個cookie只要將過期時間設置為過去的一個時間即可 } return true; }</script><style type="text/css"> div{ font-size:12px; }</style></head><body onload="window_onload()"><div><form id="loginForm" onsubmit="return login()">用戶名：<input type="text" id="userName"><br>密 碼：<input type="password" id="password"><input type="checkbox" id="currUser">記住用戶名<br><input type="submit" value="登錄"></form></div></body></html> 注意：
由于google Chrome瀏覽器為了安全只支持online-cookie,所以在本地測試時是沒有效果的，需要上傳到服務器試一下。
更多關于JavaScript操作cookie相關內容可查看本站專題：《JavaScript 操作 cookie相關知識匯總》及《jQuery的cookie操作技巧總結》
希望本文所述對大家JavaScript程序設計有所幫助。
