<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>W3Cschool教程(w3cschool.cn)</title>
</head>
<body>
<p id="demo"></p>
<script>
document.getElementById("demo").innerHTML = 123e5;
</script>
</body>
</html>
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>W3Cschool教程(w3cschool.cn)</title>
</head>
<body>
<p id="demo"></p>
<script>
document.getElementById("demo").innerHTML = ‘John Doe‘;
</script>
</body>
</html>
原文：https://www.cnblogs.com/yxs1530/p/10165535.html