假设您在浏览器中执行此操作:

等待:

import axios from 'axios'

const response = await axios.get(url, { responseType: 'blob' });
return window.URL.createObjectURL(response.data);

与承诺

import axios from 'axios'

const response = await axios.get(url, { responseType: 'blob' })
  .then((response) => {
    const dataUrl = window.URL.createObjectURL(response.data);
    // do something with your url
  });

基本上，如果你的形象是

<img id='Img1' src='someurl'>

然后你可以把它转换成

var c = document.createElement('canvas');
var img = document.getElementById('Img1');
c.height = img.naturalHeight;
c.width = img.naturalWidth;
var ctx = c.getContext('2d');

ctx.drawImage(img, 0, 0, c.width, c.height);
var base64String = c.toDataURL();

需要利用读取器将blob转换为base64，更喜欢使用async-await语法，所以我选择提取读取器逻辑到帮助器，像这样:

//* Convert resBlob to base64
export const blobToData = (blob: Blob) => {
  return new Promise((resolve) => {
    const reader = new FileReader()
    reader.onloadend = () => resolve(reader.result)
    reader.readAsDataURL(blob)
  })
}

并在主代码中使用await调用它:

//* Convert resBlob to dataUrl and resolve
const resData = await blobToData(resBlob)

document.querySelector(“输入”)。Onchange = e => { const fr = new FileReader() Fr.onloadend = () => document.write(fr.result) fr.readAsDataURL (e.target.files [0]) ｝ < input type = " file " >

假设您在浏览器中执行此操作:

等待:

import axios from 'axios'

const response = await axios.get(url, { responseType: 'blob' });
return window.URL.createObjectURL(response.data);

与承诺

import axios from 'axios'

const response = await axios.get(url, { responseType: 'blob' })
  .then((response) => {
    const dataUrl = window.URL.createObjectURL(response.data);
    // do something with your url
  });

据我所知，图像可以通过FileReader()转换为Base64字符串，也可以将其存储在canvas元素中，然后使用toDataURL()获取图像。我也遇到过类似的问题你可以参考这个。

将图像转换为已经加载的画布