鼠标点击事件

<body>
    <button onclick="console.log('asdfasdf');">按钮1</button>
    <button onclick="setbg(this)">按钮2</button>
    <script>
      //   function setbg(ele) {
      //     document.body.style.backgroundColor = "wheat";
      //     ele.style.backgroundColor = "yellow";
      //     ele.textContent = "保存成功";
      //   }
    </script>
    <script src="outer.js"></script>
</body>

获取页面中的元素

document.querySelector(css选择器)
document.querySelectorAll(css选择器)

只要css选择器用的好，没有哪个选不了

Correcting teacher：

PHPz

Correction status：qualified

Teacher's comments：作业写完整

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