smartcrop.js 内容感知图像裁剪

<!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>
    .img {
      width: 600px;
      height: 400px;
      box-sizing: border-box;
      border: 10px solid #f48;
    }
  </style>
</head>

<body>
  <img class="img" src="./b.jpg" alt="">
  <hr>
  <canvas style="background-color: #000;"></canvas>
  <script src="https://cdn.bootcss.com/smartcrop/2.0.3/smartcrop.js"></script>
  <script>
    let l = console.log;
    let image = document.querySelector('.img')
    var c = document.querySelector('canvas')
    var ctx = c.getContext('2d');

    image['onload'] = function () {
      smartcrop.crop(image, {
        minScale: 1.0,
        width: 100,
        height: 100,
        debug: true
      }).then(function (res) {
        l(res);
        l(res.topCrop);

        c.width = res.topCrop.width;
        c.height = res.topCrop.height;
        ctx.drawImage(image, res.topCrop.x, res.topCrop.y, c.width, c.height, 0, 0, c.width, c.height);
      });

    }
  </script>
</body>

</html>