<a class="downfile" href="javascript:;" fileName="abcdef.pdf">简历下载</a>
<a class="downfile" href="javascript:;" fileName="abcdef.doc">简历下载</a>

<script>
  $( function() {
    $( '.downfile' ).on( 'click', function() {
      var url = $( this ).attr( 'fileName' )
      var arr = url.split( '.' );
      var name = '简历.' + arr[ arr.length - 1 ]
      downfile( url, name )
    } )
  } )

  function downfile( url, name ) {
    var xhr = new XMLHttpRequest();
    xhr.open( 'get', url, true );
    xhr.responseType = "blob"; // 返回类型blob
    // 定义请求完成的处理函数，请求前也可以增加加载框/禁用下载按钮逻辑
    xhr.onload = function() {
      // 请求完成
      if ( this.status === 200 ) {
        // 返回200
        var blob = this.response;
        var href = window.URL.createObjectURL( blob ); //创建下载的链接
        //判断是否是IE浏览器，是的话返回true
        if ( window.navigator.msSaveBlob ) {
          try {
            window.navigator.msSaveBlob( blob, name )
          } catch ( e ) {
            console.log( e );
          }
        } else {
          // 谷歌浏览器 创建a标签 添加download属性下载
          var downloadElement = document.createElement( 'a' );
          downloadElement.href = href;
          downloadElement.target = '_blank';
          downloadElement.download = name; //下载后文件名
          document.body.appendChild( downloadElement );
          downloadElement.click(); //点击下载
          document.body.removeChild( downloadElement ); //下载完成移除元素
          window.URL.revokeObjectURL( href ); //释放掉blob对象
        }
      }
    }
    // 发送ajax请求
    xhr.send()
  }
</script>