The download file of native JS implementation can be used anywhere

demand ： Encapsulate a file download method , Call to use

function downLoadBlobFile (params) {
  // export file 
  var url = "xxxxxx"; //  Requested background address 
  var form = document.createElement("form"); 
  form.id = "form";
  form.name = "form";
  document.body.appendChild(form); 

  for (var obj in params) {
    if (!params[obj]) {
      params[obj] = "";
    }
    if (params.hasOwnProperty(obj)) {
      var input = document.createElement("input");
      input.tpye = "hidden";
      input.name = obj;
      input.value = params[obj] ? params[obj] : "";

      form.appendChild(input);
    }

  }
  form.method = "POST"; // Request mode 
  form.action = url;

  form.submit();
  document.body.removeChild(form);
}

When using, just pass in parameters ：

var params = {
        xxx: "xxxx",
        xxx: "xxx", 
        url: "xxxxxx"
   //  See what you want at the back end   Just pass it on to him 
 };

downLoadBlobFile(params)

That's all. , Let's try