cookie的应用
cookie的基础:
同一网站,其域名一样
cookie的特点:
同一个网站共享一套cookie;
数量大小有限制;
有过期时间;
js使用cookie:
document.cookie
cookie的封装
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>cookie</title> </head> <body> </body> <script> // 封装设置cookie的方法 function setCookie(name,value,iDay){ var oDate = new Date(); oDate.setDate(oDate.getDate()+iDay); document.cookie=name+'='+value+';expires='+oDate; } // 读取cookie中的某个数据 function getCookie(name){ var arr = document.cookie.split('; ');//分割 for (var i = 0; i < arr.length; i++) { var arr2 = arr[i].split('='); if (arr2[0] == name) { return arr2[1]; } return ''; } // 移除cookie中的数据 function removeCookie(name){ setCookie(name,1,-1);//-1表示已经过期 } // setCookie('username','lxs',2); // setCookie('psw','1122',5); alert(document.cookie); removeCookie('passwords'); </script> </html>
cookie的demo案例:
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Document</title> <script> function setCookie(name,value,iDay){ var oDate = new Date(); oDate.setDate(oDate.getDate()+iDay); document.cookie=name+'='+value+';expires='+oDate; } // 读取cookie中的某个数据 function getCookie(name){ var arr = document.cookie.split('; ');//分割 for (var i = 0; i < arr.length; i++) { var arr2 = arr[i].split('='); if (arr2[0] == name) { return arr2[1]; } return ''; } // 移除cookie中的数据 function removeCookie(name){ setCookie(name,1,-1);//-1表示已经过期 } window.onload=function () { var form1 = document.getElementById('form1'); var user = document.getElementsByName('user')[0]; form1.onsubmit=function(){ setCookie('user1',user.value,10); } } </script> </head> <body> <form id="form1" action="http://www.zhinengshe.com"> user:<input type="text" name="user"><br> pwd: <input type="password" name="pass"><br> <input type="submit" value="login"> </form> </body> </html>