下载pdf.js
官网地址
https://mozilla.github.io/pdf.js/

php代码

//转义两次php把中文字转义
$title =iconv("utf-8","gbk",urlencode(urlencode($info['pdf_name'])));
$url=request()->domain();
$code_content = $url.'/static/pdf/web/viewer.html?file=/static/uploads/'.$info['pdf'].'&dow='.$url.'/static/uploads/'.$info['spdf'].'&title='.$title;

js

//接受url的参数
function GetRequest() {
        var url = location.search; //获取url中"?"符后的字串
        var theRequest = new Object();
        if (url.indexOf("?") != -1) {
        var str = url.substr(1);
        var strs = str.split("&");
        for(var i = 0; i < strs.length; i ++) {
        theRequest[strs[i].split("=")[0]]=unescape(strs[i].split("=")[1]);
        }
        }
        return theRequest;
    }
    //在viewer.js中function download方法
    //转义传过来的下载名
var filename = decodeURIComponent(arr.tit);