The instance of the <ui:button> is passed as a parameter to the constructor function and I keep a reference to it as this.element.

<ui:button>的实例被作为参数传递给构造函数，我使用 this.element保持对它的引用。

youdao

By using a reference parameter, the function can access the object directly without copying it.

使用引用形参，函数可以直接访问实参对象，而无须复制它。

youdao

By using a reference parameter, the function can access the object directly without copying it.

使用引用形参，函数可以直接访问实参对象，而无须复制它。

youdao