Cannot read property 'style' of undefined at HTMLLIElement.lis.(anonymous function).onclick
想做一個點擊隱藏li標籤的簡單案例，但是報錯Cannot read property 'style' of undefined at HTMLLIElement.lis.(anonymous function).onclick 一般這種錯誤都是因爲‘style’前面的元素找不到，可以打印一下，發現是undefined，只要將lis[i]替換爲this就可以了，this指當前元素lis[i
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