TypeError: undefined is not an object (evaluating 'f.navigator') __ERROR

[FrankWasHello]

ios page loading file-saver error message, such as question, page white screen can not load, please ask how to solve? The specific code is as follows:

<script>
import domtoimage from 'dom-to-image'
import fileSaver from 'file-saver'

export default {
  methods: {
    shotPic() {
      let node = document.getElementById('my-node');

      domtoimage.toBlob(node, { quality: 1.0}).then(function (blob) {
        fileSaver.saveAs(blob, 'my-node.png');
      });
    }
  },
  components: {
    domtoimage,
    fileSaver
  }
}
</script>

package.json：

"dependencies": {
        "dom-to-image": "^2.6.0",
        "file-saver": "^2.0.5",
        "vue-qr": "^4.0.9"
    }