lovecoding
/
W260426


			
				
					
						
						
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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: 200px;
            height: 200px;
            background-color: red;
        }
    </style>
</head>
<body>
    <div class="box"></div>
    <button>点击动画</button>
    <script>
        // 获取元素
        var box = document.querySelector(".box");
        var btn = document.querySelector("button");
        // 绑定事件
        btn.onclick = function(){
            setInterval(function(){
                // 获取元素宽度
                var docWidth = box.offsetWidth;
                console.log(docWidth);
                box.style.width = (docWidth + 10) + "px";
            },16)
            // box.style.width = "400px";
        }
    </script>
</body>
</html>