javascript - 如何在无重力的情况下在phaser js中进行上下运动

Question

新手:我正在关注这个tutorial

我尝试添加上下运动，例如:

if (cursors.left.isDown) {
    //  Move to the left
    player.body.velocity.x = -150;
    player.animations.play('left');
} else if (cursors.right.isDown) {
    //  Move to the right
    player.body.velocity.x = 150;
    player.animations.play('right');
}else if (cursors.up.isDown) {
   // Move to the top
   player.body.velocity.y = -50;
   player.animations.play(‘top’);
} else if (cursors.down.isDown) {
   // Move to the bottom
   player.body.velocity.y = 50;
   player.animations.play(‘bottom’);
}

Angular 色正在移动，但是当我们按下向上箭头键时，玩家将到达游戏屏幕的顶部，而当按下向下箭头时，它将从顶部掉落。我尝试设置player.body.gravity.y = 0;它仍然会掉下来或飞起来。左右运动是完美的，向上或向下移动时我需要类似的行为。

Answer 1

我猜问题是您没有在 update 函数中清除 velocity.y，如下所示:

function update() {
    player.body.velocity.x = 0;
    player.body.velocity.y = 0;
    // below is your code from the question
}