First of all, your problem is that you don’t understand “chain call”! ! !
Then why can the first place be used?
pipeWhat about continuous calls? Let’s look at it first.Document：
gulp.srcThe return value of is a
streamYes, it can be used
pipe, called continuously.
As for what is
pipeLet’s look at another paragraphDocument：
Finally, let’s see why
watchCan’t call continuously, lookDocument:
watchThe return value of is a
pipeHow to do it! !