演示代码:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
<!-- 引入外部js文件,src后面双引号内加个空格有提示 -->
<!-- <script src="js.js" type="text/javascript" charset="utf-8"></script> -->
</head>
<body onload="alert('我也是行内引入')">
<!-- 行内引入 -->
<!-- <button onclick="alert('我是行内引入')">点击</button> -->
</body>
</html>