js如何设置按钮的颜色

<button id="myButton" style="background-color: blue; color: white;">Click Me</button>

<button id="myButton">Click Me</button>

<script>
  // 获取按钮元素
  var button = document.getElementById('myButton');
  
  // 设置背景颜色
  button.style.backgroundColor = 'blue';
  
  // 设置文字颜色
  button.style.color = 'white';
</script>

.button-style {
  background-color: blue;
  color: white;
}

<button id="myButton">Click Me</button>

<script>
  var button = document.getElementById('myButton');
  button.classList.add('button-style');
</script>