如何定義一個用於webkitTransition的常量？

Question

如何以下重寫使用變量：

element.style.webkitTransition = "opacity 1.0s ease"; 

我嘗試了這些，但他們沒有工作：

var kDuration = 1.0; 
element.style.webkitTransition = "opacity kDurations ease"; 

var kDuration = 1.0; 
element.style.webkitTransition = "opacity kDuration ease"; 

var kDuration = 1.0; 
element.style.webkitTransition = "opacity kDuration s ease"; 

var kDuration = 1.0; 
element.style.webkitTransition = "opacity kDuration + s ease"; 

var kDuration = 1.0s; 
element.style.webkitTransition = "opacity kDuration ease"; 

Answer 1

var kDurationfirst = "1.0s"; var kDuration= "opacity "+kDurationfirst +" ease"; 
element.style.webkitTransition = kDuration ;