效果如图：
实现代码如下：
html代码：
<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
<title>简单的网页留言板</title>
<script type="text/javascript" src="index.js"></script>
</head>
<body>
<h1>简单的网页留言板</h1>
<textarea id="dome" cols="60" rows="10"></textarea>
<br/>
<input type="button" value="保存" onclick="saveStorage('dome');">
<input type="button" value="清空" onclick="clearStorage('msg');">
<input type="button" value="读取" onclick="loadStorage('msg');">
<hr>
<p id="msg"></p>
</body>
</html>
index.js代码：
///**
// * Created by Administrator on 2014/11/27.
// */
//function saveStorage(id){
// var data = document.getElementById(id).value;
// var time = new Date().getTime();
// localStorage.setItem(time,data);
// alert("数据已经被保存！");
// loadStorage('msg');
//}
//function loadStorage(id){
// var reselt = '<table border="1">';
// for(var i=0;i<localStorage.length;i++)
// {
// var key = localStorage.key(i);
// var value = localStorage.getItem(key);
// var date = new Date();
// date.setTime(key);
// var datestr = date.toGMTString();
// reselt += '<tr><td>'+'这是第'+i+'条数据</td><td>'+value+'</td><td>'+datestr+'</td></tr>';
// }
// reselt += '</table>';
// var target = document.getElementById(id);
// target.innerHTML = reselt;
//}
//function clearStorage(id){
// localStorage.clear();
// alert("数据已经被成功删除！");
// loadStorage('msg');
//}
/**
* Created by Administrator on 2014/11/27.
*/
function saveStorage(id){
var data = document.getElementById(id).value;
var time = new Date().getTime();
localStorage.setItem(time,data);
alert("数据已经被保存！");
loadStorage('msg');
}
function loadStorage(id){
var reselt = '<table border="1">';
for(var i=0;i<localStorage.length;i++)
{
var value = localStorage.getItem( localStorage.key(i));
var date = new Date();
date.setTime( localStorage.key(i));
var datestr = date.toGMTString();
reselt += '<tr><td>'+'这是第'+i+'条数据</td><td>'+ localStorage.getItem( localStorage.key(i))+'</td><td>'+datestr+'</td></tr>';
}
reselt += '</table>';
var target = document.getElementById(id);
target.innerHTML = reselt;
}
function clearStorage(id){
localStorage.clear();
alert("数据已经被成功删除！");
loadStorage('msg');
}