1 <!DOCTYPE HTML>
2 <html>
3 <head>
4 <meta charset="gb2312">
5 <title>HTML5--JS API-本地存储 Web留言板</title>
6 <style type="text/css">
7 *{margin:0; padding:0;}
8 body,input{font-size:14px; line-height:24px; color:#333; font-family:Microsoft yahei, Song, Arial, Helvetica, Tahoma, Geneva;}
9 h1{margin-bottom:15px; height:100px; line-height:100px; text-align:center; font-size:24px; color:#fff; background:#0051a1;}
10 #content #post,#comment p{zoom:1;}
11 #content #post:after,#comment p:after{display:block; height:0; clear:both; visibility:hidden; overflow:hidden; content:'.';}
12 .transition{-webkit-transition:all 0.5s linear; -moz-transition:all 0.5s linear; -o-transition:all 0.5s linear; -ms-transition:all 0.5s linear; transition:all 0.5s linear;}
13 #content{margin:0 auto; width:960px; overflow:hidden;}
14 #content #post{margin-bottom:15px; padding-bottom:15px; border-bottom:1px #d4d4d4 dashed;}
15 #content #post textarea{display:block; margin-bottom:10px; padding:5px; width:948px; height:390px; border:1px #d1d1d1 solid; border-radius:5px; resize:none; outline:none;}
16 #content #post textarea:hover{border:1px #9bdf70 solid; background:#f0fbeb;}
17 #content #post #postBt,#content #post #clearBt{margin-left:5px; padding:3px; float:right;}
18 #comment{overflow:hidden;}
19 #comment p{margin-bottom:10px; padding:10px; border-radius:5px;}
20 #comment p:nth-child(odd){border:1px solid #e3e197; background:#ffd;}
21 #comment p:nth-child(even){border:1px solid #adcd3c; background:#f2fddb;}
22 #comment p span{display:inline; float:left;}
23 #comment p .msg{width:738px;}
24 #comment p .datetime{width:200px; color:#999; text-align:right;}
25 </style>
26 <script type="text/javascript">
27 var Storage =
28 {
29 saveData:function()//保存数据
30 {
31 var data = document.querySelector("#post textarea");
32 if(data.value != "")
33 {
34 var time = new Date().getTime() + Math.random() * 5;//getTime是Date对象中的方法，作用是返回 1970年01月01日至今的毫秒数
35 localStorage.setItem(time, data.value + "|" + this.getDateTime());//将毫秒数存入Key值中，可以降低Key值重复率
36 data.value = "";
37 this.writeData();
38 }
39 else
40 {
41 alert("请填写您的留言！");
42 }
43 },
44 writeData:function()//输出数据
45 {
46 var dataHtml = "", data = "";
47 for(var i = localStorage.length-1; i >= 0; i--)//效率更高的循环方法
48 {
49 data = localStorage.getItem(localStorage.key(i)).split("|");
50 dataHtml += "<p><span class=\"msg\">" + data[0] + "</span><span class=\"datetime\">" + data[1] + "</span></p>";
51 }
52 document.getElementById("comment").innerHTML = dataHtml;
53 },
54 clearData:function()//清空数据
55 {
56 if(localStorage.length > 0)
57 {
58 if(window.confirm("清空后不可恢复，是否确认清空？"))
59 {
60 localStorage.clear();
61 this.writeData();
62 }
63 }
64 else
65 {
66 alert("没有需要清空的数据！");
67 }
68 },
69 getDateTime:function()//获取日期时间，例如 2012-03-08 12:58:58
70 {
71 var isZero = function(num)//私有方法，自动补零
72 {
73 if(num < 10)
74 {
75 num = "0" + num;
76 }
77 return num;
78 }
79
80 var d = new Date();
81 return d.getFullYear() + "-" + isZero(d.getMonth() + 1) + "-" + isZero(d.getDate()) + " " + isZero(d.getHours()) + ":" + isZero(d.getMinutes()) + ":" + isZero(d.getSeconds());
82 }
83 }
84
85 window.onload = function()
86 {
87 Storage.writeData();//当打开页面的时候，先将localStorage中的数据输出一边，如果没有数据，则输出空
88 document.getElementById("postBt").onclick = function(){Storage.saveData();}//发表评论按钮添加点击事件，作用是将localStorage中的数据输出
89 document.getElementById("clearBt").onclick = function(){Storage.clearData();}//清空所有已保存的数据
90 }
91 </script>
92 </head>
93
94 <body>
95 <h1>HTML5--JS API-本地存储 Web留言板</h1>
96 <div id="content">
97 <div id="post">
98 <textarea class="transition"></textarea>
99 <input id="postBt" type="button" value="发表评论"/>
100 <input id="clearBt" type="button" value="清空所有已保存的数据"/>
101 </div>
102 <div id="comment"></div>
103 </div>
104 </body>
105 </html>
