Question

我在使用switch语句时遇到了一些困难（我之前从未使用过switch）。当我的物体到达舞台的顶部或底部时，我有一个命中测试。当发生这种情况时，我想切换状态（有问题的游戏是一个简单的平台游戏，允许玩家在击中新表面时切换重力。下面是我当前的代码：

{
    ...

    if(player.hitTestObject(bottom)) {
        //Switch state to normal
    }
    if(player.hitTestObject(top)) {
        //Switch state to inverted
    }
}

switch (myGrav){
    case "NORMAL":
        trace("Normal")
        player.gotoAndPlay(1);
        oktoJump = false;
        player.y = 376.5;

    case "INVERTED":
        trace("Inverted")
        player.gotoAndPlay(8);
        oktoJump = false;
        player.y = 12;
}

谢谢！

Answer 1

您的switch语句中的案例缺少break;因此，代码将继续通过switch语句执行。

这应该是：

var myGrav:String = "NORMAL";

if (player.hitTestObject(bottom))
    myGrav = "NORMAL";

if (player.hitTestObject(top))
    myGrav = "INVERTED";

switch (myGrav)
{
    case "NORMAL":
        trace("Normal")
        player.gotoAndPlay(1);
        oktoJump = false;
        player.y = 376.5;
        break;

    case "INVERTED":
        trace("Inverted")
        player.gotoAndPlay(8);
        oktoJump = false;
        player.y = 12;
        break;
}

Answer 2

当我能摆脱它时，我更喜欢变量。

switch (true){
    case (player.hitTestObject(bottom)):
        trace("Normal")
        player.gotoAndPlay(1);
        oktoJump = false;
        player.y = 376.5;
        break;

    case (player.hitTestObject(top)):
        trace("Inverted")
        player.gotoAndPlay(8);
        oktoJump = false;
        player.y = 12;
        break;
}

如何调用AS3 Switch

2 个答案: