无法正确地从canvas获取信息，并通过带有node-fetch的webhook将信息发送到discord

const fetch = require('node-fetch');
const { createCanvas } = require('canvas');

// 创建canvas并绘制内容
const canvas = createCanvas(200, 200);
const ctx = canvas.getContext('2d');
ctx.fillStyle = 'red';
ctx.fillRect(0, 0, 200, 200);

// 从canvas获取图像数据
const imageData = canvas.toDataURL();

// 构建要发送的数据
const data = {
  content: '从canvas获取的图像数据',
  embeds: [
    {
      image: {
        url: imageData
      }
    }
  ]
};

// 发送POST请求到discord的webhook
fetch('https://discord.com/api/webhooks/your-webhook-url', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json'
  },
  body: JSON.stringify(data)
})
  .then(response => response.json())
  .then(result => {
    console.log('信息已发送到discord');
  })
  .catch(error => {
    console.error('发送信息到discord时出错:', error);
  });