简介
定义：是一种运行在客户端（浏览器）的编程语言。 组成：ECMAScript(基础语法)、webapi(DOM、BOM) 配套视频： https://www.bilibili.com/video/BV1Y84y1L7Nn
入门体验
DOM切换按钮
<!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>01-体验js</title>
<!-- css -->
<style>
.pink {
background-color: pink;
}
</style>
</head>
<body>
<!-- html -->
<button class="pink">按钮1</button>
<button>按钮2</button>
<button>按钮3</button>
<button>按钮4</button>
<!-- js -->
<script>
let bts = document.querySelectorAll('button')
for (let i = 0; i < bts.length; i++) {
bts[i].addEventListener('click', function () {
document.querySelector('.pink').className = ''
this.className = 'pink'
})
}
</script>
</body>
</html>大约 95 分钟