[]Tween.to 执行失败

//使精灵走到鼠标位置

function walkToMousePos(sprite){

    console.log(Laya.stage.mouseX) ;

    console.log(Laya.stage.mouseY) ;

    console.log(sprite.x) ;

    console.log(sprite.y) ;

    var hDir = Laya.stage.mouseX>sprite.x? "right"  : "left" ;

    var vDir = Laya.stage.mouseY>sprite.y? "down"  : "up" ;

    //先横着走，走完之后调用竖着走的函数

    Tween.to(sprite,{x:Laya.stage.mouseX,y:sprite.y,update:new Handler(this,onWalk(hDir)),complete:Handler.create(this,function(){

        Tween.to(sprite,{x:sprite.x,y:Laya.stage.mouseY,update:new Handler(this,onWalk(vDir))}) ;

    })}) ;

    console.log(sprite.x) ;

    console.log(sprite.y) ;

    console.log("once done") ;

}





function onWalk(dir){

    switch(dir){

        case "up":

        hero_p1.roleAni.play(0,true,"p1_walk_up");

        Laya.stage.addChild(hero_p1.roleAni);

        break ;

        case "down":

        hero_p1.roleAni.play(0,true,"p1_walk_down");

        Laya.stage.addChild(hero_p1.roleAni);

        break ;

        case "left":

        hero_p1.roleAni.play(0,true,"p1_walk_left");

        Laya.stage.addChild(hero_p1.roleAni);

        break ;

        case "right":

        hero_p1.roleAni.play(0,true,"p1_walk_right");

        Laya.stage.addChild(hero_p1.roleAni);

        break ;

    }

}