--- tags: 四週帶你掌握Vue.js必要觀念, 全域物件, 屬性, 變數, delete.window, let, const, var --- window 全域物件 === window 全域物件,會有屬性和var變數 --- window 全域物件,擁有初始化屬性,會有 var、沒有 let。 ### a 屬性、var b 變數,在 window 裡面  ### let、const 變數,不在 window 裡面  delete.window.屬性 --- ### 可以用 `delete.window.屬性` 將屬性刪除  ### 但不能以此將 變數 刪除 
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