(count!= null)vs javascript中的if(!count)

Question

我发现了这个地方:而不是if (count != undefined && count != null),使用if(count != null).我可以使用if (count == null)和if(!count)互换？

Answer 1

count != undefined && count != null是完全相同一样count != null.!count如果是真实的count是null,undefined,0,NaN,空字符串,或false.