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localStorage 以及UserData[IE6 IE7]使用
说在前头:
UserData:属于IE6 IE7的老东西。麻烦且体验差,暂且不表
localStorage 属于HTML5的东西,兼容IE8以及其它W3C标准的主流浏览器。所以尽可能的具体解说
注意:
IE下须要server环境。能够使用webstorm编辑器来预览,否则会报错
相关文档:
猎聘:http://www.css88.com/archives/3717
博客园:http://www.cnblogs.com/xiaowei0705/archive/2011/04/19/2021372.html
博客园2:http://www.cnblogs.com/winterIce/archive/2011/09/16/2179281.html
教程:
0-----------------------------------------------------------------》相关属性方法
1-------------------------------------------------------------------》JavaScript userData localStorage的兼容
2-------------------------------------------------------------------》html 1
3.----------------------------------------------------------------------------------->>storage 跨浏览器通讯[IE8不支持]
------------------------------------------------------------------------------------------------------------------------------------------------------------
locaStorage:
增:
ocalStorage.a = 3;//设置a为"3"
localStorage["a"] = "sfsf";//设置a为"sfsf",覆盖上面的值
localStorage.setItem("b","isaac");//设置b为"isaac"
查:
var a1 = localStorage["a"];//获取a的值
var a2 = localStorage.a;//获取a的值
var b = localStorage.getItem("b");//获取b的值
删:
localStorage.removeItem("c");//清除c的值
事件:
if(window.addEventListener)
{
window.addEventListener("storage",handle_storage,false);
}
else if(window.attachEvent)
{
window.attachEvent("onstorage",handle_storage);
}
function handle_storage(){
alert(LocalStorage.getItem("hehe"))
}
清除全部:
localStorage.clear();
localStorage是一个集合。有length属性。能够通过遍历来获取相应的值:
var storage = window.localStorage;
function showStorage(){
for(var i=0;i<storage.length;i++){
//key(i)获得相应的键。再用getItem()方法获得相应的值
document.write(storage.key(i)+ " : " + storage.getItem(storage.key(i)) + "<br>");
}
}
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实例localStorage.js:[兼容IE6 7,用面向对象的方法写~~不知道这样表达是不是正确]:
//userData,做IE7 6 兼容
var UserData = http://www.mamicode.com/{ //新建一个UserData对象来做IE6 7的兼容,注意第一个字母大写
userData : null,//用来推断是否有userData属性,也就是推断是否是IE6 7,或者说是否支持userData属性
name : location.hostname,
init:function(){
if (!UserData.userData) {
try {
UserData.userData = http://www.mamicode.com/document.createElement(‘INPUT‘);
UserData.userData.type = "hidden";
UserData.userData.style.display = "none";
UserData.userData.addBehavior ("#default#userData");
document.body.appendChild(UserData.userData);
var expires = new Date();
expires.setDate(expires.getDate()+365);
UserData.userData.expires = expires.toUTCString();
} catch(e) {
return false;
}
}
return true;
},
setItem : function(key, value) {//设置缓存
if(UserData.init()){
UserData.userData.load(UserData.name);
UserData.userData.setAttribute(key, value);
UserData.userData.save(UserData.name);
}
},
getItem : function(key) {//获取缓存
if(UserData.init()){
UserData.userData.load(UserData.name);
return UserData.userData.getAttribute(key)
}
},
remove : function(key) { //删除缓存
if(UserData.init()){
UserData.userData.load(UserData.name);
UserData.userData.removeAttribute(key);
UserData.userData.save(UserData.name);
}
},
clear:function(){//清除全部缓存
UserData.userData.load(UserData.name);
var now = new Date();
now = new Date(now.getTime()-1);
UserData.userData.expires = now.toUTCString();
UserData.userData.save(UserData.name);
}
};
//做W3C兼容 以及IE6 7的兼容,这里的代码是我自己參照上面的代码写的。原理一样
var LocalStorage={//新建一个LocalStorage对象
localStorage: null,//用来推断是否支持localStorage
setItem:function(key,value)
//设置缓存
{
if(!LocalStorage.localStorage)//假设支持localStorage。就使用它
{
localStorage.setItem(key,value)
}
else{ //否则使用IE6 7的userData方法,也就是上面我们写的那个UserData对象的方法,以下的代码原理一样,就不备注了
UserData.setItem(key,value)
}
},
getItem:function(key)
{
if(!LocalStorage.localStorage)
{
return localStorage.getItem(key)
}
else
{
return UserData.setItem(key);
}
},
removeItem:function(key)
{
if(!LocalStorage.localStorage)
{
return localStorage.removeItem(key)
}
else
{
return UserData.removeItem(key);
}
},
clear:function()
{
if(!localStorage)
{
return localStorage.clear();
}
else{
return
UserData.clear()
}
}
};
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html:
demo.html
<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
<title></title>
</head>
<body>
<form action="">
<label for="">商品类型:<input type="text" name="name"/></label>
<label for="">标题:<input type="text" name="title"/></label>
<label for="">价格:<input type="text" name="price"/></label>
<label for=""><input type="button" value="http://www.mamicode.com/提交" id="submit"/></label>
</form>
<script src="http://www.mamicode.com/locaStorage.js"></script>
<script src="http://www.mamicode.com/jquery.js"></script>
<script>
$(function(){
var names=$("input[name=‘name‘]");
var tit=$("input[name=‘title‘]");
var price=$("input[name=‘price‘]");
var submit=$("#submit");
submit.click(function(){
//保存缓存
LocalStorage.setItem("name",names.val());
LocalStorage.setItem("title",tit.val());
LocalStorage.setItem("price",price.val());
window.location.href="http://www.mamicode.com/demo2.html";
//读取缓存
});
//读取缓存
names.attr("value",LocalStorage.getItem("name"));
tit.attr("value",LocalStorage.getItem("title"));
price.attr("value",LocalStorage.getItem("price"));
})
</script>
</body>
</html>
图示:
无论你怎样刷新。都会保存数据
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demo2.html
<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
<title></title>
</head>
<body>
<form action="">
<h1>你购买的商品例如以下:</h1>
<label for="">商品类型:<input type="text" name="name"/></label>
<label for="">标题:<input type="text" name="title"/></label>
<label for="">价格:<input type="text" name="price"/></label>
</form>
<script src="http://www.mamicode.com/locaStorage.js"></script>
<script src="http://www.mamicode.com/jquery.js"></script>
<script>
$(function(){
var names=$("input[name=‘name‘]");
var tit=$("input[name=‘title‘]");
var price=$("input[name=‘price‘]");
names.attr("value",LocalStorage.getItem("name"));
tit.attr("value",LocalStorage.getItem("title"));
price.attr("value",LocalStorage.getItem("price"));
})
</script>
</body>
</html>
图示:
及时跳转到了新页面,还是能够获取到数据
localStorage 以及UserData[IE6 IE7]使用