var data = window.openDatabase("stu","1.0","stu database",*);

data.transaction(function(tx){

    tx.executeSql("create table if not exists news (id, title)");

    tx.executeSql("select * from news where id = '1'",[],function(tx,result){

        console.log("成功"+result.rows.length);

        if(result.rows.length == ){

            tx.executeSql("select * from news where id = '123456'",[],function(tx,result){

                console.log("成功2"+result.rows.length);

            })

        }

    })

})