js 获取当前this对象

console.log(this); // 在浏览器中输出: Window {...}

function showThis() {
  console.log(this);
}

showThis(); // 在浏览器中输出: Window {...} (非严格模式)

const obj = {
  name: 'Alice',
  greet: function() {
    console.log(`Hello, I'm ${this.name}`);
  }
};

obj.greet(); // 输出: Hello, I'm Alice

function Person(name) {
  this.name = name;
}

const alice = new Person('Alice');
console.log(alice.name); // 输出: Alice

function showThis() {
  console.log(this);
}

const obj = { name: 'Alice' };

showThis.call(obj); // 输出: { name: 'Alice' }
showThis.apply(obj); // 输出: { name: 'Alice' }

const boundShowThis = showThis.bind(obj);
boundShowThis(); // 输出: { name: 'Alice' }

const obj = {
  name: 'Alice',
  greet: function() {
    setTimeout(() => {
      console.log(`Hello, I'm ${this.name}`);
    }, 100);
  }
};

obj.greet(); // 输出: Hello, I'm Alice