js - 异步加载图片到 dom

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title></title>
</head>
<body>
    <div class="container"></div>
    
    <script>
        let container = document.getElementsByClassName("container")[0];

        setTimeout(function(){
            container.style.height = "400px";
            let img = new Image();
            img.src = "./img/wy.jpg";
            img.style.height = "100%";
            img.style.objectFit = "cover";
            container.appendChild(img);
        },3000)
       
    </script>
</body>
</html>

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