###### tags:`ALPHACampWeek3`

to-do list專案 & 委任 delegatione觀念
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完整專案(細節寫在註解裡)
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https://codepen.io/ks0dcongra/pen/PoJMyNL?editors=1010

event delegation 委任
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- 子層委託父層去執行操作

https://codepen.io/alpha-camp/pen/zyPyqa

event.stopPropagation()
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- 可以避免bubbling由下而上的傳導停在這一層

element.addEventListener第三個參數
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- 可以控制是否要捕捉capture(一般用不到)

element.addEventListener("click", handler, useCapture)