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                下一個例子展示了屬性常用的訪問標識符組合: > The next example shows common access identi?er combinations for properties: ~~~ class Main { // 從外部可讀取,只在Main中寫入 public var ro(default, null):Int; // 從外部寫入,只在Main中讀取 public var wo(null, default):Int; // 通過 getter 和 setter 訪問 // get_x & set_x public var x(get, set):Int; // 通過 getter 讀取,不可寫入 public var y(get, never):Int; // 被字段 x 需要 function get_x() return 1; // 被字段 x 需要 function set_x(x) return x; // 被字段 y 需要 function get_y() return 1; function new() { var v = x; x = 2; x += 1; } static public function main() { new Main(); } } ~~~ JavaScript 輸出幫助我們理解 main 方法中的字段訪問被編譯為: > The JavaScript output helps understand what the ?eld access in the main-method is compiled to: ~~~ var Main = function() { var v = this.get_x(); this.set_x(2); var _g = this; _g.set_x(_g.get_x() + 1); }; ~~~ 就像說明的,讀取訪問生成一個get_x()的調用,而寫入訪問生成 set_x(2)的調用,2即為被賦值到x 的值。 +=生成的方式可能看起來有點奇怪,但是可以通過下面的例子很容易的證明: > As speci?ed, the read access generates a call to get_x(), while the write access generates a call to set_x(2) where 2 is the value being assigned to x. The way the += is being generated might look a little odd at ?rst, but can easily be justi?ed by the following example: ~~~ class Main { public var x(get, set):Int; function get_x() return 1; function set_x(x) return x; public function new() { } static public function main() { new Main().x += 1; } } ~~~ 這里發生的是,字段的表達式部分在main方法中訪問x是復雜的:它有潛在的副作用,如本例中Main的構建。因此,編譯器不能生成 += 操作符 為 new Main().x = new Main().x+1, 而且必須緩存復雜的表達式到一個局部變量: > What happens here is that the expression part of the ?eld access to x in the main method is complex: It has potential side-effects, such as the construction of Main in this case. Thus, the compiler can not generate the += operationas new Main().x = new Main().x + 1 andhas to cache the complex expression in a local variable: ~~~ Main.main = function() { var _g = new Main(); _g.set_x(_g.get_x() + 1); } ~~~
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