医学金字塔书籍下载

提供医学金字塔书籍下载按钮，下载整本书籍

// ==UserScript==
// @name              医学金字塔书籍下载
// @namespace          ccc
// @version            1.0.1
// @description       提供医学金字塔书籍下载按钮，下载整本书籍
// @author            andrew.asa
// @icon              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// @namespace         https://greasyfork.org/users/
// @require           https://cdn.bootcss.com/jquery/3.5.1/jquery.min.js
// @require           https://cdn.bootcss.com/html2canvas/0.5.0-beta4/html2canvas.js
// @require           https://cdn.bootcss.com/jspdf/1.3.4/jspdf.debug.js
// @match             *://www.jztyx.com/read/*
// @license           GPL License
// @grant             unsafeWindow
// @grant             GM_openInTab
// @grant             GM.openInTab
// @grant             GM_getValue
// @grant             GM.getValue
// @grant             GM_setValue
// @grant             GM.setValue
// @grant             GM_xmlhttpRequest
// @grant             GM.xmlHttpRequest
// @grant             GM_registerMenuCommand
// ==/UserScript==

(function () {
    'use strict';
    var $ = $ || window.$;
    function getBookHashId(){
        var url = document.location.toString();
        var arrUrl = url.split("//");

        var start = arrUrl[1].indexOf("/");
        var relUrl = arrUrl[1].substring(start);//stop省略，截取从start开始到结尾的所有字符

        if(relUrl.indexOf("?") != -1){
            relUrl = relUrl.split("?")[0];
        }
        var book_hash_id = relUrl.split("/")[2].split(".")[0]

        return book_hash_id;
    }

    function getBookPageUrl(bookHashId,page){
        return '/imgFileStream/' + bookHashId+'/'+page;
    }

    // 从url中获取图片
    function getImgFromUrl(url,callback){
        var img = new Image();
        img.src = url;
        img.onload = function() {
            callback(img);
            console.log("complete download " + url);
        };
        var tryTime = 0;
        img.onerror = function(){
            tryTime ++;
            if(tryTime<4){
                console.log("download "+url + "error try to get angain");
                getImgFromUrl(url,callback);
            }else{
                console.log("超过尝试次数" +url);
            }
        }
    }

    function getImgFromUrls(urls,callback){
        var data = {};
        var urlLen = urls.length;
        for(const url of urls){
            getImgFromUrl(url,function(img){
                data[url]=img;
                urlLen--;
                if(urlLen<=0){
                    callback(data)
                }
            });
        }
    }

    $("#top").append("<a href='#' id='downloadpdf'>下载</a><div id='downloadpdftip'></div>");
    $("#downloadpdf").click(function(){
        console.log("正在下载");
        $("#downloadpdf").hide();
        $("#downloadpdftip").empty().text("正在下载，耐心等待...");
        var imageUrls =[];
        var bookName = $($("#top").find("a")[1]).text();
        var bookHashId = getBookHashId();
        var pageNum = $('#page center').first().contents().eq(2).text().replace(/\//g,'').replace(/ /g,'');
        var doc = new jsPDF();
        imageUrls=[];
        for(var i=1;i<=pageNum;i++){
            imageUrls[i-1]=getBookPageUrl(bookHashId,i);
        }
        getImgFromUrls(imageUrls,function(imgs){
            console.log("正在导出");
            var first = 1;
            for(const url of imageUrls){
                if(first){
                    first=0;
                }else{
                    doc.addPage(200,300);
                }
                doc.addImage(imgs[url],'JPG', 0, 0,200,300);
                console.log("create pdf "+url);
            }
            doc.save(bookName+".pdf");
            $("#downloadpdf").show();
            $("downloadpdftip").hide();
        });

    });
})()