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29 lines (29 loc) · 967 Bytes
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Hello World</title>
<script type="text/javascript">
alert("Hello World");//弹窗
document.write("(Hello World)");//输出在页面body
console.log("Hello World")//输出在控制台
console.clear();//清除控制
</script>
<script>
alert("我是head的script")
</script>
<!-- 外部文件，利用浏览器的缓存机制-->
<script type="text/javascript" src="HelloWorld.html"></script>
</head>
<body>
<script>
alert("我是内部body的script")
</script>
<!--可以将JavaScript编写到onclick代码中-->
<!--可以写在标签的属性中，但属于结构和属性耦合，不便于维护-->
<button onclick="alert('Hello World')">点我</button>
<!--可以将JavaScript编写到onclick代码中-->
<a href="javascript:alert('Hello World');">点我一下</a>
<a href="javascript:;">点我一下</a>
</body>
</html>