HTML 单击a标签 实现下载文件而不是浏览器打开预览

<a d ownload class="down" title="">
 function download(src,name) {        // 创建隐藏的可下载链接        var eleLink = document.createElement('a');        eleLink.href = src;        eleLink.download = name;        eleLink.style.display = 'none';        eleLink.href = src;        document.body.appendChild(eleLink);        eleLink.click();        document.body.removeChild(eleLink);    }
//js下载文件
case 'show':                var urls = data.fileurl;
                var three = urls.split(".");                var last = '.' + three[three.length - 1];                last = last.toLowerCase();                if (last == ".pdf") {                    common.CreateAddForm('查看', urls, {                         '100%',                        height: '100%'                    });                } else {                    download(urls, data.filename);                }                break;