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並前往https://teamtreehouse.com/community/why-we-dont-need-to-write-let-button-eventtarget-and-just-start-with-let-li-eventtargetparentnode

Why we don't need to write let button = event.target and just ...

tagName == 'LI'){ let li = event.target; let ul = li. ... are in the scope of <div class='list'> due // to the if statement event.target.

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