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HTML5本地存储应用sessionStorage跟localStorage

网友分享于:2013-11-02  浏览:0次
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

sessionStorage的应用:

 1 <!DOCTYPE html>
 2 <html>
 3 <head lang="en">
 4     <meta charset="UTF-8">
 5     <title></title>
 6     <script>
 7         window.onload = function(){
 8             var aInput = document.getElementsByTagName('input');
 9             aInput[0].onclick = function(){
10                 //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
11                 window.sessionStorage.setItem("name", aInput[3].value );
12             };
13             aInput[1].onclick = function(){
14                 alert(window.sessionStorage.getItem("name" ));
15             };
16             aInput[2].onclick = function(){
17                 window.sessionStorage.removeItem("name" );
18             };
19         }
20     </script>
21 </head>
22 <body>
23 <input type="button" value="设置" />
24 <input type="button" value="获取" />
25 <input type="button" value="删除" />
26 <br/>
27 <input type="text" />
28 </body>
29 </html>

localStorage的应用

 1 <!DOCTYPE html>
 2 <html>
 3 <head lang="en">
 4     <meta charset="UTF-8">
 5     <title></title>
 6     <script>
 7         window.onload = function(){
 8             var aInput = document.getElementsByTagName('input');
 9             aInput[0].onclick = function(){
10                 //localStorage : 永久性存储
11                 window.localStorage.setItem("name", aInput[3].value);
12                 window.localStorage.setItem("name2", 'aaaaa');
13             };
14             aInput[1].onclick = function(){
15                 alert( window.localStorage.getItem( "name" ) );
16                 alert( window.localStorage.getItem( "name2" ) );
17             };
18             aInput[2].onclick = function(){
19                 window.localStorage.removeItem("name");
20 //                window.localStorage.clear();
21             };
22         }
23     </script>
24 </head>
25 <body>
26 <input type="button" value="设置" />
27 <input type="button" value="获取" />
28 <input type="button" value="删除" />
29 <br/>
30 <input type="text" />
31 </body>
32 </html>
 1 <!DOCTYPE html>
 2 <html>
 3 <head lang="en">
 4     <meta charset="UTF-8">
 5     <title></title>
 6     <script>
 7         window.onload = function () {
 8             var aInput = document.getElementsByTagName("input");
 9             var oT = document.querySelector("textarea");
10 
11             if (window.localStorage.getItem("userName")) {
12                 aInput[0].value = window.localStorage.getItem("userName");
13             }
14 
15             for (var i = 0; i < aInput.length; i++) {
16                 if (window.localStorage.getItem('sex') == aInput[i].value) {
17                     aInput[i].checked = true;
18                 }
19             }
20 
21             if (window.localStorage.getItem("note")) {
22                 oT.value = window.localStorage.getItem("note");
23             }
24 
25             window.onunload = function () {
26                 if (aInput[0].value) {
27                     window.localStorage.setItem("userName", aInput[0].value);
28                 }
29 
30                 for (var i = 0; i < aInput.length; i++) {
31                     if (aInput[i].checked == true) {
32                         window.localStorage.setItem('sex', aInput[i].value);
33                     }
34                 }
35 
36                 if (oT.value) {
37                     window.localStorage.setItem('note', oT.value);
38                 }
39             }
40         }
41     </script>
42 </head>
43 <body>
44 <p>
45     用户名: <input type="text"/>
46 </p>
47 
48 <p>
49     性别: <br/>
50     <input type="radio" name="sex" value="男"/>男
51     <input type="radio" name="sex" value="女"/>女
52 </p>
53 
54 <p>
55     备注:
56     <textarea cols="30" rows="10"></textarea>
57 </p>
58 
59 </body>
60 </html>

 

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