This article systematically organizes the grammar of JavaScript. The knowledge points are very complete and basic. It can be used as a reference when studying. The review is also very systematic. There is no need to read books. The knowledge points in the books are very scattered. After reading them It's a waste of time. If you don't mind it, you can save it for future reference. Being helpful to everyone is my motivation to continue writing articles. I am also happy to share my knowledge with everyone.
1-1 The starting point for learning JavaScript is to process web pages. We first learn how to use DOM for simple operations.
<body>
<p id="p1">我是第一段文字</p>
<p id="p2">我是第二段文字</p>
<script type="text/javascript">
document.write("hello"); # 输出文本
document.getElementById("p1").style.color="blue"; # 第一段文字变蓝色了
</script>
</body>1-2 Internal reference
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
