cordova – 如何等到回调函数返回？

function directPath(src,dest)
{
    var db = window.openDatabase("Database","1.0","PhoneGap Demo",200000);
    db.transaction(queryDB,errorCB);
    return arrayroute;
}

function queryDB(tX)
{
    tx.executesql(query,[],querysuccess,errorCB);
}

function querysuccess(tx,results) {
    //Write some code here.
}

function errorCB(err) {
    alert("Error in sql: " + err);
}

问题是我想等到回调@L_944_7@querysuccess在从directPath@L_944_7@返回之前完成执行.