zipdownload.js

if(!document.body.innerHTML.match(/jszip/)){
  var ele = document.createElement("script");
  ele.type = "text/javascript";
  ele.src = "https://cdnjs.cloudflare.com/ajax/libs/jszip/3.1.3/jszip.min.js";
  document.body.appendChild(ele);
  var ele2 = document.createElement("script");
  ele2.type = "text/javascript";
  ele2.src = "https://fastcdn.org/FileSaver.js/1.1.20151003/FileSaver.min.js";
  document.body.appendChild(ele2);
  setTimeout(makezip,100);
}
else {
  makezip();
}
function makezip() {
var zip = new JSZip();
var img = zip.folder("images");
var f = $('img').length;
for(var i=0;i<f;i++){
  if($('img')[i].src.match(/data:image/) && $('img')[i].alt!=="noise"){
    var data = $('img')[i].src.replace("data:image/png;base64,","");
    img.file(i + ".png", data, {base64: true});
  }
  if(i===f-1){
    zip.generateAsync({type:"blob"}).then(function(content) {
      saveAs(content, "img.zip");
    });
  }
}
}