js 生成文件并下载

function download(filename, text) {
  var element = document.createElement('a');
  element.setAttribute('href', 'data:text/plain;charset=utf-8,' + encodeURIComponent(text));
  element.setAttribute('download', filename);
  
  element.style.display = 'none';
  document.body.appendChild(element);
  
  element.click(); 
  document.body.removeChild(element);
} 
  
download("hello.txt","This is the content of my file :)");