lovecoding
/
Web1020


			
				
					
						
						
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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>Document</title>
    <style>
        div{
            color: red;
        }
        .box{
            color: blue;
        }
        #box2{
            color: green;
        };
    </style>
</head>
<body>
    <div>1</div>
    <div>a</div>
    <span class="box">2</span>
    <p id="box2">3</p>
    <script>
        // 标签/元素选择器
        var aDiv = document.getElementsByTagName('div');
        console.log(aDiv[1]);
        // 类选择器
        var aSpan = document.getElementsByClassName('box');
        console.log(aSpan);
        // id选择器
        var oP = document.getElementById("box2"); 
        console.log(oP);   
    </script>
</body>
</html>