html2cavas实现生成图片

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>

    <style>
        * {
            margin: 0;
            padding: 0;
        }

        .box {
            padding: 30px;
            box-sizing: border-box;
            background: #fff;
        }

        img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .text {
            font-size: 20px;
            text-align: center;
        }
    </style>
</head>

<body>
    <div class="box">
        <img src="https://sucai.suoluomei.cn/sucai_zs/images/20191204145036-pic.png" alt="">
        <div class="text">保存为文字+图片</div>
    </div>
    <img class="store" src="" alt="">
</body>
<script src="https://cdn.bootcss.com/html2canvas/0.5.0-beta4/html2canvas.min.js"></script>
<script defer>
    var main = document.querySelector('.box');
    var width = main.offsetWidth
    var height = main.offsetHeight
    var scale = 3;
    var canvas = document.createElement("canvas");
    canvas.width = width * scale;
    canvas.height = height * scale;
    canvas.getContext("2d").scale(scale, scale);
    var opation = { canvas: canvas, useCORS: true, }
    html2canvas(main, opation).then((canvas) => {
        var dataUrl = canvas.toDataURL();
        document.querySelector('.store').src = dataUrl
    })
</script>

</html>