cookie sessionStorage localStorage

cookie：只在特定url下有效

sessionStorage：浏览器关闭则失效

localStorage：手动删除则失效，否则一直保留

Cookie

<script src="jquery.js"></script>
<script src="jquery.cookie.js"></script>
$.cookie('key','value');
$.cookie('key');

sessionStorage

<script src="jquery.js"></script>
window.sessionStorage.setItem('key','value');
window.sessionStorage.getItem('key');

//如果未引入jq，用js
sessionStorage.setItem('key','value');
sessionStorage.getItem('key');

localStorage

<script src="jquery.js"></script>
window.localStorage.setItem('key','value');
window.localStorage.getItem('key');

//如果未引入jq，用js
localStorage.setItem('key','value');
localStorage.getItem('key');