方法可以通過 dynamic 關鍵字 使它們可綁定（重綁定）： > Methods can be denoted with the dynamic keyword to make them (re-)bindable: ~~~ class Main { static dynamic function test() { return "original"; } static public function main() { trace(test()); // original test = function() { return "new"; } trace(test()); // new } } ~~~ 第一次調用 test() 調用了原來的函數，返回字符串 “original”。下一行，test被分配了一個新的函數。這恰恰是dynamic做到的：函數字段可以被分配一個新的函數。其結果是，下一次調用 test() 返回字符串 “new” 。 > The ?rst call to test() invokes the original function which returns the String "original". In the next line, test is assigned a new function. This is precisely what dynamic allows: Function ?elds can be assigned a new function. As a result,the next invocation of test() returnsthe String "new". 動態字段因為明顯的理由不能內聯：內聯是在編譯時執行，動態函數必須被在運行時決定。 > Dynamic ?elds cannot be inline for obvious reasons: While inlining is done at compiletime, dynamic functions necessarily have to be resolved at runtime.