Rumah >hujung hadapan web >Tutorial H5 >HTML5本地存储应用sessionStorage和localStorage
在html5之前,浏览器要实现数据的存储,一般都是用cookie,但是cookie有域名和大小限定.
html5流行之后,可以通过localStorage和sessionStorage实现浏览器端的数据存储,这两者有什么特点呢?
sessionStorage
sessionStorage属于临时会话,数据存储的有效期为:从页面打开到页面关闭的时间段,属于窗口的临时存储,页面关闭,本地存储消失
localStorage
永久存储(可以手动删除数据)
存储量限制 ( 5M )
客户端完成,不会请求服务器处理
sessionStorage数据在页面之间不能共享、 而localStorage可以实现页面之间共享
sessionStorage的应用:
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title></title> <script> window.onload = function(){ var aInput = document.getElementsByTagName('input'); aInput[0].onclick = function(){ //sessionStorage: 临时存储, 只在当前页面有效,不能传递到其他页面,页面关闭之后消失 window.sessionStorage.setItem("name", aInput[3].value ); }; aInput[1].onclick = function(){ alert(window.sessionStorage.getItem("name" )); }; aInput[2].onclick = function(){ window.sessionStorage.removeItem("name" ); }; } </script> </head> <body> <input type="button" value="设置" /> <input type="button" value="获取" /> <input type="button" value="删除" /> <br/> <input type="text" /> </body> </html>
localStorage的应用
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title></title> <script> window.onload = function(){ var aInput = document.getElementsByTagName('input'); aInput[0].onclick = function(){ //localStorage : 永久性存储 window.localStorage.setItem("name", aInput[3].value); window.localStorage.setItem("name2", 'aaaaa'); }; aInput[1].onclick = function(){ alert( window.localStorage.getItem( "name" ) ); alert( window.localStorage.getItem( "name2" ) ); }; aInput[2].onclick = function(){ window.localStorage.removeItem("name"); // window.localStorage.clear(); }; } </script> </head> <body> <input type="button" value="设置" /> <input type="button" value="获取" /> <input type="button" value="删除" /> <br/> <input type="text" /> </body> </html>
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title></title> <script> window.onload = function () { var aInput = document.getElementsByTagName("input"); var oT = document.querySelector("textarea"); if (window.localStorage.getItem("userName")) { aInput[0].value = window.localStorage.getItem("userName"); } for (var i = 0; i < aInput.length; i++) { if (window.localStorage.getItem('sex') == aInput[i].value) { aInput[i].checked = true; } } if (window.localStorage.getItem("note")) { oT.value = window.localStorage.getItem("note"); } window.onunload = function () { if (aInput[0].value) { window.localStorage.setItem("userName", aInput[0].value); } for (var i = 0; i < aInput.length; i++) { if (aInput[i].checked == true) { window.localStorage.setItem('sex', aInput[i].value); } } if (oT.value) { window.localStorage.setItem('note', oT.value); } } } </script> </head> <body> <p> 用户名: <input type="text"/> </p> <p> 性别: <br/> <input type="radio" name="sex" value="男"/>男 <input type="radio" name="sex" value="女"/>女 </p> <p> 备注: <textarea cols="30" rows="10"></textarea> </p> </body> </html>
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