Say there is an object called obj , and it has an attribute named attr .(假设有一个名为obj ，它有一个名为attr 。)
In some function body I access the attribute say three times using a syntax like this ( obj.attr ).(在某些函数体中，我使用类似这样的语法（ obj.attr ）访问属性说了三遍。) Is there a disadvantage to declaring a local variable const objAttr = obj.attr , and using it in place of obj.attr ?(声明局部变量const objAttr = obj.attr并使用它代替obj.attr是否有缺点？) I would declare the local variable to avoid the cost of repeatedly accessing attr from its obj .(我将声明局部变量，以避免从obj重复访问attr的开销。) But I am wondering if there might be a disadvantage to creating the local variable for the mere sake of avoiding repeated access calls?(但是我想知道，仅仅为了避免重复访问而创建局部变量是否有不利之处？)
ask by faint-hearted-fool translate from so
与恶龙缠斗过久,自身亦成为恶龙；凝视深渊过久,深渊将回以凝视…
