JS設定cookie，刪除cookie
js設定cookie有很多種方法。 第一種：（這個是w3c官網的程式碼）
<script> //設定cookie function setCookie(cname, cvalue, exdays) { var d = new Date(); d.setTime(d.getTime() + (exdays*24*60*60*1000)); var expires = "expires="+d.toUTCString(); document.cookie = cname + "=" + cvalue + "; " + expires; } //獲取cookie function getCookie(cname) { var name = cname + "="; var ca = document.cookie.split(";"); for(var i=0; i<ca.length; i++) { var c = ca[i]; while (c.charAt(0)==" ") c = c.substring(1); if (c.indexOf(name) != -1) return c.substring(name.length, c.length); } return ""; } //清除cookie function clearCookie(name) { setCookie(name, "", -1); } function checkCookie() { var user = getCookie("username"); if (user != "") { alert("Welcome again " + user); } else { user = prompt("Please enter your name:", ""); if (user != "" && user != null) { setCookie("username", user, 365); } } } checkCookie(); </script>
第二種：
<script> //JS操作cookies方法! //寫cookies function setCookie(c_name, value, expiredays){ var exdate=new Date(); exdate.setDate(exdate.getDate() + expiredays); document.cookie=c_name+ "=" + escape(value) + ((expiredays==null) ? "" : ";expires="+exdate.toGMTString()); } //讀取cookies function getCookie(name) { var arr,reg=new RegExp("(^| )"+name+"=([^;]*)(;|$)"); if(arr=document.cookie.match(reg)) return (arr[2]); else return null; } //刪除cookies function delCookie(name) { var exp = new Date(); exp.setTime(exp.getTime() - 1); var cval=getCookie(name); if(cval!=null) document.cookie= name + "="+cval+";expires="+exp.toGMTString(); } //使用示例 setCookie("username","Darren",30) alert(getCookie("username")); </script>
第三個例子
<html> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <head> <script language="JavaScript" type="text/javascript"> function addCookie(objName, objValue, objHours){//新增cookie var str = objName + "=" + escape(objValue); if (objHours > 0) {//為0時不設定過期時間，瀏覽器關閉時cookie自動消失 var date = new Date(); var ms = objHours * 3600 * 1000; date.setTime(date.getTime() + ms); str += "; expires=" + date.toGMTString(); } document.cookie = str; alert("新增cookie成功"); } function getCookie(objName){//獲取指定名稱的cookie的值 var arrStr = document.cookie.split("; "); for (var i = 0; i < arrStr.length; i++) { var temp = arrStr[i].split("="); if (temp[0] == objName) return unescape(temp[1]); } } function delCookie(name){//為了刪除指定名稱的cookie，可以將其過期時間設定為一個過去的時間 var date = new Date(); date.setTime(date.getTime() - 10000); document.cookie = name + "=a; expires=" + date.toGMTString(); } function allCookie(){//讀取所有儲存的cookie字串 var str = document.cookie; if (str == "") { str = "沒有儲存任何cookie"; } alert(str); } function $(m, n){ return document.forms[m].elements[n].value; } function add_(){ var cookie_name = $("myform", "cookie_name"); var cookie_value = $("myform", "cookie_value"); var cookie_expireHours = $("myform", "cookie_expiresHours"); addCookie(cookie_name, cookie_value, cookie_expireHours); } function get_(){ var cookie_name = $("myform", "cookie_name"); var cookie_value = getCookie(cookie_name); alert(cookie_value); } function del_(){ var cookie_name = $("myform", "cookie_name"); delCookie(cookie_name); alert("刪除成功"); } </script> </head> <body> <form name="myform"> <div> <label for="cookie_name"> 名稱 </label> <input type="text" name="cookie_name" /> </div> <div> <label for="cookie_value"> 值 </lable> <input type="text" name="cookie_value" /> </div> <div> <label for="cookie_expireHours"> 多少個小時過期 </lable> <input type="text" name="cookie_expiresHours" /> </div> <div> <input type="button" value="新增該cookie" onclick="add_()"/><input type="button" value="讀取所有cookie" onclick="allCookie()"/><input type="button" value="讀取該名稱cookie" onclick="get_()"/><input type="button" value="刪除該名稱cookie" onclick="del_()"/> </div> </form> </body> </html>
注意： chrome瀏覽器在本地獲取不到cookie。必須在伺服器上才可以。如果是本地的話，你可以放到local的www目錄下面。 Google Chrome只支援線上網站的cookie的讀寫操作，對本地HTML的cookie操作是禁止的。所以下面的程式碼如果你寫在一個本地的html檔案中，將彈出的對話方塊內容為空。 document.cookie = "Test=cooo"; alert(document.cookie); 如果這個頁面是線上網站的內容，則會正常顯示cookie內容Test=cooo等等