在html5之前,瀏覽器要實現資料的存儲,通常都是用cookie,但是cookie有網域名稱和大小限定.
html5流行之後,可以透過localStorage和sessionStorage實現瀏覽器端的資料存儲,這兩者有什麼特色呢?
sessionStorage
sessionStorage屬於臨時會話,資料儲存的有效期為:從頁面開啟到頁面關閉的時間段,屬於視窗的暫存,頁面關閉,本地儲存消失
localStorage
永久儲存(可以手動刪除資料)
儲存量限制( 5M )
客戶端完成,不會請求伺服器處理
sessionStorage資料在頁面之間不能共享、 而localStorage可以實現頁面之間共享
sessionStorage的應用程式:
<!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的應用程式
<!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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