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 lang="en">

     <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 lang="en">

     <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 lang="en">

     <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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HTML5本地存储应用sessionStorage和localStorage

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