js页面缓存类

JavaScript代码

 

var Storage = new Class({   
    initialize: function(name){   
        this.name = name || 'storage';   
        if (window.ie) {   
            this.storage = new Element('span').setStyle("behavior","url('#default#userData')").injectInside(document.body);   
        } else if (globalStorage) {   
            this.storage = globalStorage[location.hostname];   
        }   
    },   
    
    get: function(key) {   
        if (window.ie) {   
            this.storage.load('storage');   
            return Json.evaluate('(' + this.storage.getAttribute(key) + ')');   
        } else if (this.storage) {   
            var data = Json.evaluate('(' + this.storage.getItem(this.name) + ')');   
            return (data) ? data[key] : null;   
        } else {   
            return false;   
        }   
    },   
    
    set: function(key, value) {   
        if (window.ie) {   
            this.storage.setAttribute(key, Json.toString(value));   
            this.storage.save('storage');   
        } else if (this.storage) {   
            var data = Json.evaluate('(' + this.storage.getItem(this.name) + ')');   
            if (!data) data = {};   
            data[key] = value;   
            this.storage.setItem(this.name, Json.toString(data));   
        } else {   
            return false;   
        }   
        return true;   
    },   
    
    clear: function(key) {   
        if (window.ie) {   
            this.storage.removeAttribute(key);   
            this.storage.save('storage');   
        } else if (this.storage) {   
            var data = Json.evaluate('(' + this.storage.getItem(this.name) + ')');   
            if (data) data[key] = undefined;   
            this.storage.setItem(this.name, Json.toString(data));   
        } else {   
            return false;   
        }   
        return true;   
    }   
});