apply bind call写一些案例代码

1. 使用apply调用函数，并传递参数

function greeting(name) {
  console.log(`Hello, ${name}!`);
}

greeting.apply(null, ['John']);
// 输出：Hello, John!

2. 使用bind绑定函数this值

const person = {
  name: 'John',
  age: 30,
  greeting: function() {
    console.log(`Hello, my name is ${this.name} and I'm ${this.age} years old.`);
  }
};

const sayGreeting = person.greeting.bind(person);
sayGreeting();
// 输出：Hello, my name is John and I'm 30 years old.

3. 使用call调用函数，并传递参数

function greeting(name) {
  console.log(`Hello, ${name}! My name is ${this.name}.`);
}

const person = {
  name: 'John'
};

greeting.call(person, 'Mary');
// 输出：Hello, Mary! My name is John.

4. 使用apply绑定函数this值和传递参数

function greeting(name) {
  console.log(`Hello, ${name}! My name is ${this.name}.`);
}

const person = {
  name: 'John'
};

greeting.apply(person, ['Mary']);
// 输出：Hello, Mary! My name is John.