<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>

$(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()
}