Download multiple files at a time

digester.js

var itemurl=`https://cdn.hxmanga.com/file/majekayoo/record-of-ragnarok/Chapter-68/`
for(let i=1; i<=42; i++){
    setTimeout(() => {
      //let num = i < 10 ? '0' + i : i;        
      //if less than 100 add 1 zeros to the left and if less than 10 add 2 zeros to the left
      let num = i.toString().padStart(3, '0');
      
      fetch(itemurl+`${num}.jpg`)
        .then(resp => resp.blob())
        .then(blob => {
          const url = window.URL.createObjectURL(blob);
          const a = document.createElement('a');
          a.style.display = 'none';
          a.href = url;
          // the filename you want
          a.download = `rog-${i}.jpg`;
          document.body.appendChild(a);
          a.click();
          window.URL.revokeObjectURL(url);
        })
        .catch(() => alert('oh no!'));
    }, i*1000);
  }