**Haxe 3.1.0 以后** > **Since Haxe 3.1.0** 如果一個構造函數聲明為 內聯（第4.4.2），編譯器在某些情況下會嘗試優化它。有下面幾個需要： > If a constructor is declared to be inline (4.4.2), the compiler may try to optimize it away in certain situations. There are several requirements for this to work: * 構造函數調用的結果必須直接分配到一個局部變量 * 構造函數字段的表達式必須只包含給它的字段的賦值。 > * The result of the constructor call must be directly assigned to a local variable. > * The expression of the constructor ?eld must only contain assignments to its ?elds. 下面的例子演示了內聯構造函數： > The following example demonstrates constructor inlining: ~~~ class Point { public var x:Float; public var y:Float; public inline function new(x:Float, y:Float) { this.x = x; this.y = y; } } class Main { static public function main() { var pt = new Point(1.2, 9.3); } } ~~~ 看一下JavaScript的輸出，揭示了效果： > A look at the JavaScript output reveals the effect: ~~~ Main.main = function() { var pt_x = 1.2; var pt_y = 9.3; }; ~~~