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[PHP典型模塊與項目實戰大全]-第一章(javascript cookie)   javascript 建立 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; }   javascript 讀取 cookie   function getCookie(cname) {     var name = cname + “=”;     var ca = document.cookie.split(‘;’);     for(var i=0; i         var c = ca[i];         while (c.charAt(0)==‘ ‘) c = c.substring(1);         if (c.indexOf(name) == 0) return c.substring(name.length,c.length);     }     return “”; }   javascript 確認 cookie   function checkCookie() {     var username=getCookie(“username”);     if (username!=“”) {         alert(“Welcome again “ + username);     }else{         username = prompt(“Please enter your name:”, “”);         if (username != “” && username != null) {             setCookie(“username”, username, 365);         }     } }