如何在nativescript-vue中调整base64图像的高度和宽度？

import { ImageSource } from "tns-core-modules/image-source";

// 将base64字符串转换为ImageSource对象
const imageSource = ImageSource.fromBase64(base64String);

<template>
  <Page>
    <StackLayout>
      <Image :src="imageSource" stretch="aspectFit" width="200" height="200" />
    </StackLayout>
  </Page>
</template>

<script>
export default {
  data() {
    return {
      imageSource: null
    };
  },
  mounted() {
    // 将base64字符串转换为ImageSource对象
    this.imageSource = ImageSource.fromBase64(base64String);
  }
};
</script>