actionscript-3 - 1050 无法分配给非参考值 as3

Question

我遇到了一些错误"1050: Cannot assign to a non-reference value."，我对编码还是很陌生，所以无法修复这个错误令人沮丧，任何帮助将不胜感激。

var PracticeDummyHealth:int=50
var PlayerAttack:int=20;

public function PlayerAttackFunction(){
    if(PracticeDummyHealth>0){
        PracticeDummyHealth-PlayerAttack=PracticeDummyHealth;
    }
}

Answer 1

不是属性/变量名称的语法结构位于赋值运算符的左侧：=

// expression                   = expression
PracticeDummyHealth-PlayerAttack=PracticeDummyHealth;
// which makes as much sense to ActionScript as .. it's not an equation solver :)
// 100 - 50 = 100

与此有效代码进行比较：

// variable         = new_value
PracticeDummyHealth = PracticeDummyHealth - PlayerAttack;
// or
PracticeDummyHealth -= PlayerAttack;

请注意，在这两种情况下，“引用”（阅读：属性/变量名称）都出现在（或复合）的左侧。这个术语来自处理 l 值的规范，不幸的是它在这里没有产生更好的错误消息。=-=