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                >[success] # window ![](https://img.kancloud.cn/e3/5e/e35e6a2e86d61f1a2e14cdcf98d44a11_476x477.png) 1. 在**ECMAScript規范** 中提出要提供全局變量,在瀏覽器中為`window`,在node環境中為`global`,但現在為統一目前已經指定了對應的標準,稱之為**globalThis** 2. var定義的變量會被添加到window對象 3. window默認給我們提供了全局的函數和類:setTimeout、Math、Date、Object等
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