带有图标的材料设计精简版（MDL）按钮

Question

MDL中的

有两个选项：普通按钮：

    <button className="mdl-button mdl-js-button">
      Continue with Facebook
    </button>

和图标按钮：

    <button className="mdl-button mdl-js-button mdl-button--icon">
      <i className="material-icons">mood</i>
    </button>

如何在左边有一个带图标的按钮，例如

    <button className="mdl-button mdl-js-button mdl-button--raised mdl-button--icon-left">
      <i className="material-icons">mood</i> Continue with Facebook
    </button>

Answer 1

这个怎么样：

<button class="mdl-button mdl-js-button mdl-button--raised mdl-button--colored mdl-js-ripple-effect">
  <i class="material-icons">add_shopping_cart</i>Add to shopping cart
</button>

Codepen

Answer 2

通过添加背景图片解决它：

background-image: 'url("/assets/images/facebook-icon.png")';
background-repeat: 'no-repeat';
background-size: 'contain',