通过ID来获取页面元素：document.getElementById(‘id’);
<body>
<div id="ce">测试</div>
<script>
let ce = document.getElementById('ce')
console.log(ce);
</script>
</body>
通过类名来获取页面元素：document.getElementsByClassName(‘类名’);
<body>
<div class="ce">测试</div>
<script>
let ce = document.getElementsByClassName('ce')
console.log(ce[0]);
</script>
</body>
通过标签名来获取页面元素：document.getElementsByTagName(‘标签名’);
<body>
<div>测试</div>
<div>测试2</div>
<script>
let ce = document.getElementsByTagName('div')
console.log(ce);
</script>
</body>
通过标签name属性获取页面元素：document.getElementsByName(‘name属性的值’);
<body>
<div name="ce">测试</div>
<script>
let ce = document.getElementsByName('ce')
console.log(ce[0]);
</script>
</body>
H5新增的获取元素的方式:document.querySelector(‘选择器’); id带#,class带.
<body>
<div id="ce1">测试1</div>
<div class="ce2">测试2</div>
<script>
let ce1 = document.querySelector('#ce1')
let ce2 = document.querySelector('.ce2')
console.log(ce1);
console.log(ce2);
</script>
</body>
H5新增的获取元素的方式:document.querySelectorAll(‘选择器’); 获取满足条件的所有元素
<body>
<div id="ce1">测试1</div>
<div class="ce2">测试2</div>
<script>
let ce = document.querySelectorAll('div')
console.log(ce[0]);
console.log(ce[1]);
</script>
</body>