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📜  8.2.使用未定义的数组 - Javascript 代码示例

📅  最后修改于: 2022-03-11 15:04:05.433000             🧑  作者: Mango

代码示例1
let programmingLanguages = ["JavaScript", "Python", "Java", "C#"];
console.log(programmingLanguages[-1]);
console.log(programmingLanguages[100]);

//undefined
//undefined