代码示例:(标识:js_function_tostring)
<!DOCTYPE html>
<html>
<body>

<h1>JavaScript 函数</h1>

<h2>toString() 方法</h2>

<p>toString() 方法将函数作为字符串返回:</p>

<p id="demo"></p>

<script>
function myFunction(a, b) {
  return a * b;
}
document.getElementById("demo").innerHTML = myFunction.toString();
</script>

</body>
</html>
运行结果: