如何判断函数对象是否是用胖箭头表达式创建的？

function isFatArrowFunction(func) {
  const funcString = func.toString();
  return funcString.includes("=>");
}

// 示例使用
const normalFunction = function() {
  console.log("This is a normal function.");
};

const fatArrowFunction = () => {
  console.log("This is a fat arrow function.");
};

console.log(isFatArrowFunction(normalFunction)); // false
console.log(isFatArrowFunction(fatArrowFunction)); // true

function isFatArrowFunction(func) {
  return func.constructor === Function;
}

// 示例使用
const normalFunction = function() {
  console.log("This is a normal function.");
};

const fatArrowFunction = () => {
  console.log("This is a fat arrow function.");
};

console.log(isFatArrowFunction(normalFunction)); // false
console.log(isFatArrowFunction(fatArrowFunction)); // true