编译时case 0出现Expected Expression错误的排查与修复

错误原因 #

编译提示case 0处Expected Expression错误，核心原因是case分支没有被包裹在switch代码块内，同时代码末尾存在多余的闭合括号，且函数声明后缺失代码块起始的{。case是switch语法的组成部分，必须紧跟switch(变量)声明才能被编译器识别。

修复后的完整代码 #

function changeDifficulty(change:Int = 0):Void {
    switch(change) {
        case 0:
            easy.loadGraphic(Paths.image('storymenu/easyglow'));
            normal.loadGraphic(Paths.image('storymenu/normal'));
            hard.loadGraphic(Paths.image('storymenu/hard'));
            FlxTween.tween(easy,{y: 286},0.1,{ease: FlxEase.expoInOut, onComplete: function(flxTween:FlxTween){}});
            FlxTween.tween(normal,{y: 266},0.1,{ease: FlxEase.expoInOut, onComplete: function(flxTween:FlxTween){}});
            FlxTween.tween(hard,{y: 266},0.1,{ease: FlxEase.expoInOut, onComplete: function(flxTween:FlxTween){}});
        case 1:
            easy.loadGraphic(Paths.image('storymenu/easy'));
            normal.loadGraphic(Paths.image('storymenu/normalglow'));
            hard.loadGraphic(Paths.image('storymenu/hard'));
            FlxTween.tween(easy,{y: 266},0.1,{ease: FlxEase.expoInOut, onComplete: function(flxTween:FlxTween){}});
            FlxTween.tween(normal,{y: 286},0.1,{ease: FlxEase.expoInOut, onComplete: function(flxTween:FlxTween){}});
            FlxTween.tween(hard,{y: 266},0.1,{ease: FlxEase.expoInOut, onComplete: function(flxTween:FlxTween){}});
        case 2:
            easy.loadGraphic(Paths.image('storymenu/easy'));
            normal.loadGraphic(Paths.image('storymenu/normal'));
            hard.loadGraphic(Paths.image('storymenu/hardglow'));
            FlxTween.tween(easy,{y: 266},0.1,{ease: FlxEase.expoInOut, onComplete: function(flxTween:FlxTween){}});
            FlxTween.tween(normal,{y: 266},0.1,{ease: FlxEase.expoInOut, onComplete: function(flxTween:FlxTween){}});
            FlxTween.tween(hard,{y: 286},0.1,{ease: FlxEase.expoInOut, onComplete: function(flxTween:FlxTween){}});
    }
}

关键修改点 #

• 新增switch(change)语句，将所有case分支包裹在switch代码块内
• 补全函数声明后缺失的代码块起始{
• 移除末尾多余的闭合括号

内容的提问来源于stack exchange，提问作者HollowFans