用js怎么将div中01的内容提取到span里？就是打开html的，div显示的是01，同时span显示的也是01
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
</head>
<body>
<div>01</div>
<span></span>
</body>
</html>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
</head>
<body>
<div id='box1'>01</div>
<span id='box2'></span>
<script>
document. getElementById('box2').innerText = document. getElementById（'box1').innerText;
</script>
</body>
</html>
修改后的代码如下：
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
</head>
<body>
<div>01</div>
<span></span>
<script>
document.getElementsByTagName('span')[0].innerText = document.getElementsByTagName('div')[0].innerText;
</script>
</body>
</html>