typescript函数参数继承自

function greet(name: string) {
  console.log("Hello, " + name + "!");
}

greet("John"); // 输出: Hello, John!

function greet(name: string, greeting: string = "Hello") {
  console.log(greeting + ", " + name + "!");
}

greet("John"); // 输出: Hello, John!
greet("John", "Hi"); // 输出: Hi, John!

function greet(name: string, greeting?: string) {
  if (greeting) {
    console.log(greeting + ", " + name + "!");
  } else {
    console.log("Hello, " + name + "!");
  }
}

greet("John"); // 输出: Hello, John!
greet("John", "Hi"); // 输出: Hi, John!

function greet(greeting: string, ...names: string[]) {
  for (let name of names) {
    console.log(greeting + ", " + name + "!");
  }
}

greet("Hello", "John", "Alice", "Bob"); // 输出: Hello, John!  Hello, Alice!  Hello, Bob!