JS fetch检查文件是否存在而不下载内容

fetch(url, { method: 'HEAD' })
  .then(response => {
    if (response.ok) {
      console.log('文件存在');
    } else {
      console.log('文件不存在');
    }
  })
  .catch(error => {
    console.log('请求出错', error);
  });

fetch(url, { method: 'HEAD' })
  .then(response => {
    if (response.status === 200) {
      console.log('文件存在');
    } else if (response.status === 404) {
      console.log('文件不存在');
    } else {
      console.log('请求出错，状态码：', response.status);
    }
  })
  .catch(error => {
    console.log('请求出错', error);
  });

const urls = ['url1', 'url2', 'url3'];

Promise.all(urls.map(url => fetch(url, { method: 'HEAD' })))
  .then(responses => {
    responses.forEach((response, index) => {
      if (response.status === 200) {
        console.log(`文件${index + 1}存在`);
      } else if (response.status === 404) {
        console.log(`文件${index + 1}不存在`);
      } else {
        console.log(`文件${index + 1}请求出错，状态码：`, response.status);
      }
    });
  })
  .catch(error => {
    console.log('请求出错', error);
  });