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                ### 主要表達式 JavaScript中基本關鍵字和常用表達式。 - [`this`](https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Operators/this) `this` 關鍵字指向函數的執行上下文。 - [`function`](https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Operators/function) `function` 關鍵字定義了函數表達式。 - [`class`](https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Operators/class) `class` 關鍵字定義了類表達式。 - [`function*`](https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Operators/function*) `function*` 關鍵字定義了一個 generator 函數表達式。 - [`yield`](https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Operators/yield) 暫停和恢復 generator 函數。 - [`yield*`](https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Operators/yield*) 委派給另外一個generator函數或可迭代的對象。 - `async function` `async function` 定義一個異步函數表達式。 - [`await`](https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Operators/await) 暫停或恢復執行異步函數,并等待promise的resolve/reject回調。 - [`[\]`](https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Global_Objects/Array) 數組初始化/字面量語法。 - [`{}`](https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Operators/Object_initializer) 對象初始化/字面量語法。 - [`/ab+c/i`](https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Global_Objects/RegExp) 正則表達式字面量語法。 - [`( )`](https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Operators/Grouping) 分組操作符。
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