web Storage功能;
sessionStorage;记录浏览器还没有关闭之前的数据;
appweb1.js
function saveStorage(id) {
var target=document.getElementById(id);
var str=target.value;
//保存数据key value
sessionStorage.setItem("message",str);
}
function loadStorage(id) {
var target=document.getElementById(id);
var msg=sessionStorage.getItem("message");
target.innerHTML=msg;
}
index.html
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<script src="appweb1.js"></script>
</head>
va
<body>
<p id="msg"></p>
<input type="text" id="input">
<input type="button" value="保存数据" onclick="saveStorage('input')">
<input type="button" value="读取数据" onclick="loadStorage('msg')">
</body>
</html>
localStorage:保存到硬件设备中;通常保存用户密码;浏览器关闭了也能读取;
function saveStorage(id) {
var target=document.getElementById(id);
var str=target.value;
//保存数据key value
localStorage.setItem("message",str);
}
function loadStorage(id) {
var target=document.getElementById(id);
var msg=localStorage.getItem("message")
target.innerHTML=msg;
}
============================================================
简单的留言本;
function savestoragge(id) {
var data=document.getElementById(id).value;
var time=new Date().getTime();
localStorage.setItem(time,data);
alert("数据已储存");
loadStoragge('msg')
}
function loadStoragge(id) {
var result="<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);
result+="<tr><td>"+value+"</td><td>"+date+"</td></tr>";
}
result+="</table>";
var target=document.getElementById(id);
target.innerHTML=result;
}
//清楚所有数据
function clearstoragge() {
localStorage.clear();
alert("数据已经清除;");
loadStoragge('msg')
}
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<script src="appweb1.js"></script>
</head>
<body>
<p id="msg"></p>
<textarea id="memo" cols="60" rows="10"></textarea>
<br/>
<input type="button" value="追加数据" onclick="savestoragge('memo')">
<input type="button" value="删除数据" onclick="clearstoragge()">
</body>
</html>
==================================
作为数据库使用;
function saveStorage() {
var data=new Object();
data.name=document.getElementById("name").value;
data.email=document.getElementById("email").value;
data.tel=document.getElementById("tel").value;
data.memo=document.getElementById("memo").value;
var str=JSON.stringify(data);//已json数据进行保存;
localStorage.setItem(data.name,str);
alert("数据已保存");
}
function findStorage(id) {
var find=document.getElementById('find').value;
var str=localStorage.getItem(find);
var data=JSON.parse(str);
var result="姓名:"+data.name+"<br/>";
result+="email:"+data.email+"<br/>";
result+="tel:"+data.tel+"<br/>";
result+="memo:"+data.memo;
var target=document.getElementById(id);
target.innerHTML=result;
}
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<script src="appweb1.js"></script>
</head>
<body>
<table>
<tr>
<td>姓名:</td>
<td><input type="text"id="name"> </td>
</tr>
<tr>
<td>Email:</td>
<td><input type="text"id="email"> </td>
</tr>
<tr>
<td>电话:</td>
<td><input type="text"id="tel"> </td>
</tr>
<tr>
<td>备注:</td>
<td><input type="text"id="memo"> </td>
</tr>
<tr>
<td></td>
<td><input type="button" value="保存" onclick="saveStorage()"> </td>
</tr>
</table>
<p>
检索
<input type="text" id="find">
<input type="button" value="检索" onclick="findStorage('msg')">
</p>
<p id="msg"></p>
</body>
</html>