(function(){
    var dbObject = {};   
    dbObject.open = function(params){
        //数据库名
        dbObject.db_name = params.db_name;
        //数据库版本
        dbObject.db_version = params.db_version;
        //存储对象名
        dbObject.store_name = params.store_name;
        //IndexedDB对象 
        dbObject.db = null; 

        if (!window.indexedDB){  
            console.log("你的浏览器不支持IndexedDB,请更换浏览器");  
        }  
        var request = indexedDB.open(dbObject.db_name, dbObject.db_version); 
        //打开数据库成功 
        request.onsuccess = function(event){
            console.log("打开IndexedDB数据库" + dbObject.db_name + "成功");  
            dbObject.db = event.target.result;
            if (params.success_callback){
                params.success_callback();
            }
        }
        //打开数据库失败
        request.onerror = function(event) {
            console.log("打开IndexedDB数据库" + dbObject.db_name + "失败"); 
            console.log(event);
            if (params.error_callback){
                params.error_callback();
            } 
        }
        //当打开的数据库版本高于当前版本时触发
        request.onupgradeneeded = function(event){
            console.log("IndexedDB数据库" + dbObject.db_name + "版本升级到" + dbObject.db_version); 
            dbObject.db = event.target.result;
            if(!dbObject.db.objectStoreNames.contains(dbObject.store_name)){
                dbObject.db.createObjectStore(dbObject.store_name);
            }
        }
    }

    //添加或修改
    dbObject.put = function(key, value){
    	try{
	        if (!dbObject.db){
	            return;
	        }

	        //此处必须显式声明事务  
	        var transaction = dbObject.db.transaction(dbObject.store_name, "readwrite");
	        var store = transaction.objectStore(dbObject.store_name);  
	        var request = store.put(value, key);  
	        request.onsuccess = function(){  
	            // console.log("编辑IndexedDB记录成功：" + key); 
	        } 
	        request.onerror = function(event){ 
	            console.log("编辑IndexedDB记录失败：" + key);  
	            console.log(event);
	        }
	    }
	    catch(e){
	    	console.log(min_now() + "添加或修改IndexedDB失败");
	    	console.log(e);
	    	console.log(key);
	    	console.log(value);
	    }
    }

    //删除  
    dbObject.delete = function(key){
    	try{
	        if (!dbObject.db){
	            return;
	        }
	        var transaction = dbObject.db.transaction(dbObject.store_name, "readwrite");
	        var store = transaction.objectStore(dbObject.store_name);
	        var request = store.delete(key);  
	        request.onsuccess = function(){  
	            // console.log("删除IndexedDB记录成功：" + key);   
	        }
	        request.onerror = function(event){ 
	            console.log("删除IndexedDB记录失败：" + key);  
	            console.log(event);  
	        }
	    }
	    catch(e){
	    	console.log(min_now() + "删除IndexedDB失败");
	    	console.log(e);
	    	console.log(key);
	    }  
    }
  
    //根据key获取value  
    dbObject.get = function(key, succ_callback){
    	try{
	        if (!dbObject.db){
	            return;
	        }
	        var transaction = dbObject.db.transaction(dbObject.store_name, "readwrite");
	        var store = transaction.objectStore(dbObject.store_name);
	        var request = store.get(key);
	        request.onsuccess = function(){  
	            succ_callback(request.result);  
	        }  
	        request.onerror = function(event){ 
	            console.log("获取IndexedDB记录失败：" + key); 
	            console.log(event);  
	        }
	    }
	    catch(e){
	    	console.log(min_now() + "获取IndexedDB失败");
	    	console.log(e);
	    	console.log(key);
	    }
    } 

    //获取所有的value
    dbObject.get_allvalue = function(success_callback, error_callback){
    	try{
	        if (!dbObject.db){
	            return;
	        }
	        var transaction = dbObject.db.transaction(dbObject.store_name, "readwrite");
	        var store = transaction.objectStore(dbObject.store_name);
	        var request = store.getAll();
	        request.onsuccess = function(){
	            if (success_callback){ 
	                success_callback(request.result); 
	            } 
	        }  
	        request.onerror = function(event){ 
	            console.log("获取IndexedDB记录失败：all"); 
	            console.log(event);
	            if (error_callback){
	                error_callback();
	            }
	        }
	    }
	    catch(e){
	    	console.log(min_now() + "获取全部的IndexedDB失败");
	    	console.log(e);
	    }
    } 

    //游标遍历
    dbObject.get_cursor = function(success_callback, error_callback){
    	try{
	        if (!dbObject.db){
	            return;
	        }
	        var transaction = dbObject.db.transaction(dbObject.store_name, "readwrite");
	        var store = transaction.objectStore(dbObject.store_name);
	        var request = store.openCursor();

	        request.onsuccess = function(event){
	            if (success_callback){ 
	                success_callback(event.target.result); 
	            }
	        }  
	        request.onerror = function(event){ 
	            console.log("获取IndexedDB记录失败：游标"); 
	            console.log(event);
	            if (error_callback){
	                error_callback();
	            }
	        }
	    }
	    catch(e){
	    	console.log(min_now() + "获取IndexedDB游标失败");
	    	console.log(e);
	    }	    
    } 

    //清除整个对象存储(表) 
    dbObject.clear = function(){
    	try{
	        if (!dbObject.db){
	            return;
	        }
	        var transaction = dbObject.db.transaction(dbObject.store_name, "readwrite");
	        var store = transaction.objectStore(dbObject.store_name); 
	        var request = store.clear();
	        request.onsuccess = function(){  
	            console.log("清空IndexedDB对象存储成功：" + dbObject.store_name); 
	        }  
	        request.onerror = function(event){ 
	            console.log("清空IndexedDB对象存储失败：" + dbObject.store_name); 
	            console.log(event);  
	        }
	    }
	    catch(e){
	    	console.log(min_now() + "清除IndexedDB失败");
	    	console.log(e);
	    }	 
    }

    window.dbObject = dbObject;  
})();