15.JS_DOM.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>DOM</title>
</head>
<body>
    <div id="box1">这是一个ID选择器标签</div>
    <div class="box2">这是一个类选择器标签</div>
    <div>普通div选择器</div>
    <button>按钮</button>
    <script>
        var a = document.getElementById('box1')
        var b = document.getElementsByClassName('box2')[0]
        var c = document.getElementsByTagName('div')[2]
        console.log(a)
        a.innerHTML = '修改ID选择器标签的文本内容'
        b.innerText = '修改后的类标签文本内容'
        c.style.color = 'red'
        c.style.fontSize = '30px'

        //DOM属性绑定事件
        var button_element = document.getElementsByTagName('button')[0]
        console.log(button_element)

        button_element.onclick = function(){
            alert('DOM属性按键触发')
        }
    </script>
</body>
</html>