回调函数可以根据不同的情况，调用不同的函数。
const sayHello = (name, callback) => {
console.log(`Hello, ${name}!`);
callback();
}
const sayGoodbye = () => console.log("Goodbye!");
const saySeeyou = () => console.log("See you!");
sayHello("Jon",sayGoodbye);
sayHello("Kate",saySeeyou );
展开/折叠结果
Hello, Jon!
Goodbye!
Hello, Kate!
See you!
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