$.ajax not function(已 解决:jQuery库冲突解决办法)

盛夏的果实

js文件开头已的定义$符号.导致后续,$.ajax 错误,不能识别$符号.,
http://www.lovetime.top/2018/01/21/jQuery-clash-1/ 
得到灵感
文件开头自定的处:

const $ = (el) => document.querySelector(el);
$('.selectIpt').addEventListener('change', handleFiles);
function handleFiles() {
  const files = this.files;
  for (let i = 0, len = files.length; i < len; i++) {
    showFilePreview(files[i]);
  }
  //上传文件
  uploadfile();
}

修改前的:

<script>
  var btn = document.getElementById("processTask");
  btn.addEventListener('click',function(){
    var method = GetUrlPara();
    // console.log(method);
    // console.log(filename);
    $.ajax({
      type: 'POST',
      url: "/getfilename",
      data: {"filename":filename,"method":method},
      cache: false,
      processData: false,
      contentType: false,
      success: function (ret) {
        alert(ret);
      }
    });
  },false)
</script>

修改后的:

//提交文件名称,执行操作方法
function commitfilename() {
  jQuery.noConflict();
  var method = GetUrlPara();
  jQuery(document).ready(function(){
    jQuery("#processTask").text("文件上传中....！")
    jQuery.ajax({
      type: 'POST',
      url: "/ingetfilename",
      data: {"filename":filename,"method":method},
      dataType:"json",
      success: function (ret) {
        alert(ret);
      }
    });
  })
}