lovecoding
/
web0715


			
				
					
						
						
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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>
        .box{
            width: 100px;
            height: 100px;
            background-color: red;
        }
    </style>
</head>
<body>
    <div class="box"></div>
    <script>
        var oBox = document.getElementsByClassName("box")[0];
        oBox.onclick = function(){
            oBox.style.width = "200px";
            // 如果出现 background-color 修改成backgroundColor 驼峰命名方式
            oBox.style.backgroundColor="blue";
            this.style.height = "400px";
        }
        var oHtml = document.documentElement;
        console.log(oHtml)
        oHtml.onclick = function(){
            console.log("click")
        }
    </script>
</body>
</html>