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6 lines
322 B
6 lines
322 B
// 添加小括号，表示 arr 是数组，数组中既有 number 类型，也可以有 string 类型的元素
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let arr: (number | string)[] = [1, 3, 'a', 'b']
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// 不添加小括号，表示 arr1 既可以是 number 类型，又可以是 string[]
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let arr1: number | string[] = ['a', 'b']
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let arr2: number | string[] = 123
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