在 HTML 頁面中，我有 7 個按鈕帶有以下 ID：#I、#II、#III、#IV、#V、#VI、#VII放置在rContainer div 中。我想設置與觸摸按鈕相關的iActiveButton變量。我的代碼似乎工作正常，但我覺得它可以增強和縮短。任何的想法？var iActiveButton;function touchHandler(){  console.log(iActiveButton);}rContainer.addEventListener("touchstart", function(){  I.addEventListener("touchstart", function(){iActiveButton = 1;}, false);  II.addEventListener("touchstart", function(){iActiveButton = 2;}, false);  III.addEventListener("touchstart", function(){iActiveButton = 3;}, false);  IV.addEventListener("touchstart", function(){iActiveButton = 4;}, false);  V.addEventListener("touchstart", function(){iActiveButton = 5;}, false);  VI.addEventListener("touchstart", function(){iActiveButton = 6;}, false);  VII.addEventListener("touchstart", function(){iActiveButton = 7;}, false);  touchHandler();}, false);