JavaScript本地存储实践（html5的localStorage和ie的userData）的实例页面

     var editor = document.getElementById("editor");
    editor.value="";
    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);
            }

        }
    };

    window.onbeforeunload=function(){
        if(!window.localStorage){
            UserData.setItem('editor-text',editor.value);
        }else{
            localStorage.setItem('editor-text',editor.value);
        }

    };
    window.onload=function(){
        if(!window.localStorage){
            if(UserData.getItem('editor-text')==undefined) {
                editor.value="";
            }else{
                editor.value=UserData.getItem('editor-text');
            }
        }else{
            if(localStorage.getItem('editor-text')!=null){
                editor.value=localStorage.getItem('editor-text');
            }else{
                editor.value="";
            }
        } 

    };
    document.getElementById("save").onclick=function(){
        //localStorage.removeItem('text');
        if(!window.localStorage){
            UserData.remove('editor-text');
        }else{
            localStorage.removeItem('editor-text');
        }
    }

 

 引用自：http://www.css88.com/demo/localstorage/