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Expand Up @@ -290,7 +290,7 @@ console.log(greetign)

代码打印出了一个对象，这是因为我们在全局对象上创建了一个空对象！当我们将 `greeting` 写错成 `greetign` 时，JS 解释器实际在上浏览器中将它视为 `global.greetign = {}`（或者 `window.greetign = {}`）。

为了避免这个为题，我们可以使用 `"use strict"。这能确保当你声明变量时必须赋值。
为了避免这个问题，我们可以使用 `"use strict"。这能确保当你声明变量时必须赋值。

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