JS-对象-Dom案例

<!DOCTYPE html>
<html lang="en">
<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>JS-对象-DOM-案例</title>
</head>

<body>
    <img id="h1" src="img/off.gif">  <br><br>

    <div class="cls">传智教育</div>   <br>
    <div class="cls">黑马程序员</div>  <br>

    <input type="checkbox" name="hobby"> 电影
    <input type="checkbox" name="hobby"> 旅游
    <input type="checkbox" name="hobby"> 游戏
</body> 

<script>
    //1. 点亮灯泡 : src 属性值
    var img=document.getElementById('h1');
    img.src="img/on.gif";


    //2. 将所有div标签的内容后面加上: very good (红色字体) -- <font color='red'></font>
    var divs=document.getElementsByTagName('div');
    for (let i = 0; i < divs.length; i++) {
        const divsi = divs[i];
        divsi.innerHTML+="<font color='red'>very godd<font>";
        
    }


    //3. 使所有的复选框呈现选中状态
    var hobbys=document.getElementsByName('hobby');
    for (let i = 0; i < hobbys.length; i++) {
        const hobby = hobbys[i];
        hobby.checked=true;
        
    }

</script>
</html>