web_examples/webapp/JS/Introduction/Introduction.html at main · yue24413/web_examples · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>introduce</title>
</head>
<style>
    .example1,.example2{
        margin: 50px;
        font-size: 1.5rem;
        line-height: 3rem;
        background-color: #eeeeee;
    }
</style>
<body>
    <div class="example1">
    <h2>JavaScript in Body</h2>
    <p id="demo">A Paragraph.</p>
    <button type="button" onclick="myFunction()">Try it</button>
</div>
<div class="example2">
    1.组成：ECMAScript + Web APIS(DOM+BOM);JS语言基础+页面文档对象类型+浏览器对象类型 <br>
    2.书写位置：<br>
    内部，写在body最底部；<br>
    外部，body最底部用script引入；&lt;script urc='my.js'>&lt;/script> <br>
    内联，与CSS行内相似，&lt;button onlick="alert ('aaa')">click me!&lt;/button> <br>


</div>
    <script>
        function myFunction(){
            document.getElementById("demo").innerHTML="Paragraph changed" /*.innerHTML用来改变找到的元素内部的HTML内容*/
        }
    </script>
</body>
</html>