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10 lines
312 B
10 lines
312 B
// 声明变量并立即初始化值，此时，可以省略类型注解
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let age = 20
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// 注意：如果声明变量但没有立即初始化值，此时，必须手动添加类型注解
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let a: number
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// 此时函数返回值类型可以省略
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function add(num1: number, num2: number) {
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return num1 + num2
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}
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