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locStorage
/
userData.html

<!doctype html><html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta http-equiv="X-UA-Compatible" content="IE=10" />
<title>标题</title>
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0, user-scalable=no" />
</head>
<script type="text/javascript">
var UserData = {
    userData: null,
    name: location.hostname,
    //this.name = "css88.com";
    init: function() {
        if (!UserData.userData) {
            try {
                UserData.userData = 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) {
        if (UserData.init()) {
            UserData.userData.load(UserData.name);
            UserData.userData.setAttribute(key, value);
            UserData.userData.save(UserData.name);
        }
    },
    getItem: function(key) {
        if (UserData.init()) {
            UserData.userData.load(UserData.name);
            return UserData.userData.getAttribute(key)
        }
    },
    remove: function(key) {
        if (UserData.init()) {
            UserData.userData.load(UserData.name);
            UserData.userData.removeAttribute(key);
            UserData.userData.save(UserData.name);
        }

    }
};
</script>
<body>
<script type="text/javascript">
    UserData.setItem("dd","sdfsd");
    alert(UserData.getItem("dd"));
</script>

</body>
</html>