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How to reference javascript into HTML: 1. Add js code in the event attribute of the element; 2. Add script anywhere in the html page; 3. Write js code in a separate js file.
The operating environment of this article: windows7 system, html5&&javascript version 1.8.5, Dell G3 computer.
How to reference javascript into html?
Three introduction methods
1. Inline: Add js code in the event attribute of the element, and js will be executed when the event is triggered
2 . Internal: Add script anywhere in the html page (recommended in the head)
3. External: Write js code in a separate js file and introduce it through the src attribute of script. If the script tag introduces the file, Cannot continue to write js code in the tag body
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
<!-- 内部引入方式-->
<script type="text/javascript">
alert("使用内部引入");
var x = "123";
if(isNaN(x)){
alert("不是数");
}else{
alert("是数");
}
</script>
<!-- 外部引入方式-->
<script type="text/javascript" src="first.js"></script>
</head>
<body>
<!-- 内联方式-->
<input type="button" value="内联引入方式"
onclick="alert('内联引入方式')">
</body>
</html>[Recommended learning: javascript advanced tutorial]
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