javascript設定和擷取cookie的方法執行個體詳解,javascriptcookie
本文執行個體講述了javascript設定和擷取cookie的方法。分享給大家供大家參考,具體如下:
1. 設定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. 擷取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"> //擷取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; } //設定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; } //頁面載入時間處理函數 function window_onload() { var userNameElem = document.getElementById("userName");//使用者名稱輸入框對象 var passwordElem = document.getElementById("password");//密碼輸入框對象 var currUserElem = document.getElementById("currUser");//複選框對象 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();//使用者名稱輸入框獲得焦點 } } //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("使用者名稱或密碼不可為空!"); if(userNameElem.value=="") { userNameElem.focus();//使用者名稱輸入框獲得焦點 } else { passwordElem.focus();//密碼輸入框獲得焦點 } return false; } if(currUserElem.checked) { setCookie("currUser",userNameElem.value,"","");//設定cookie } else { var nowDate = new Date();//當前日期 nowDate.setMonth(nowDate.getMonth()-2);//將cookie的到期時間設定為之前的某個日期 cookieExpires = nowDate.toGMTString();//到期時間的格式必須是GMT日期的格式 setCookie("userName","",cookieExpires,"");//刪除一個cookie只要將到期時間設定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()">使用者名稱:<input type="text" id="userName"><br>密 碼:<input type="password" id="password"><input type="checkbox" id="currUser">記住使用者名稱<br><input type="submit" value="登入"></form></div></body></html>
注意:
由於google Chrome瀏覽器為了安全只支援online-cookie,所以在本地測試時是沒有效果的,需要上傳到伺服器試一下。