數組使用封閉的方括號，并在其中使用逗號分隔值來初始化。一個扁平的 [] 表示空數組，而[1,2,3]用三個元素初始化一個數組。 > Arrays are initialized by enclosing comma , separated values in brackets []. A plain [] represents the empty array, whereas [1, 2, 3] initializes an array with three elements 1, 2 and 3. 生成的代碼可能在不支持數組初始化的平臺不那么簡潔。本質上，這樣的初始化代碼看起來如下： > The generated code may be less concise on platforms that do not support array initialization. Essentially, such initialization code then looks like this: ~~~ var a = new Array(); a.push(1); a.push(2); a.push(3); ~~~ 在聲明時要考慮這個，是否一個函數應該被內聯（第4.4.2節），因為它可能內聯比在語句中看到的更多的代碼。 > This should be considered when deciding if a function should be inlined (4.4.2) as it may inline more code than visible in the syntax. 高級初始化技術在數組推導（第6.6節）中詳述。 > Advanced initialization techniques are described in Array Comprehension (Section 6.6).