https://openstd.samr.gov.cn/bzgk/gb/index

// ==UserScript==// @name         国标下载// @namespace    http://tampermonkey.net/// @version      0.1// @description  try to take over the world!// @author       wcd// @match        http://c.gb688.cn/*// @icon         https://www.google.com/s2/favicons?sz=64&domain=gb688.cn// @grant        none// @require      https://code.jquery.com/jquery-3.6.0.min.js
// ==/UserScript==
(function() {    'use strict';$(function(){
    $("head").append('<script src="https://cdnjs.cloudflare.com/ajax/libs/jspdf/2.5.1/jspdf.umd.min.js"></script>');
    let my_script=`<script>
            function px2Num(px) {                return Number(px.split("px")[0].toString());            }

            function getPages(){                if( $("canvas[id^=canvas_]").length > 0 ) {                    $("canvas[id^=canvas_]").delete();
                }                var baseurl = "http://c.gb688.cn/bzgk/gb/";                var pagecount = $("div.page").length;                var pages = new Array(pagecount);                var pagebg = new Array(pagecount);                var title = $("title").text().split("|")[1].toString().trim();                var pheight = $("#0").css("height");                var pwidth = $("#0").css("width");
                $(".page").each(function(i, elem) {                    if (elem.hasAttribute("bg")) {                        pagebg[i] = elem.getAttribute("bg");                    } else {                        pagebg[i] = $(elem).children("span").first().css("background-image").split('"')[                            1].split(/\\//).slice(-1)[0];                    }                });

                //拼合图片                $(".page").each(function(i, elem) {                    var canvasclone = $("canvas#canvas").clone();                    canvasclone.attr("id","canvas_"+i).css("background-color","#FFFFFFFF");                    $("#newimg").append(canvasclone);                    var canvas = document.getElementById('canvas_'+i);                    var ctx = canvas.getContext('2d');                    ctx.fillStyle="white";                    ctx.fillRect(0,0,px2Num(pwidth), px2Num(pheight));
                    $("#imgContainer").append("<img id=img_" + i + " src='" + baseurl+pagebg[i] + "' />")                    var image = document.getElementById('img_'+i);
                    image.addEventListener('load', e => {                        $(elem).children("span").each(function(j,s){                             ctx.drawImage(image, -px2Num($(s).css("background-position-x")), -px2Num($(s).css("background-position-y")),  119, 168,                             $(s).attr("class").split('-')[1]*119, $(s).attr("class").split('-')[2]*168, 119, 168);                        });                    });
                });            }
            function isimgComplete(imgs){                //$("img[id^=img_]")                flag = true;                for(i=0;i<imgs.length;i++){                    flag=flag && imgs[i].complete;                }                return flag;            }
            function downloadPDF(){                if( $("canvas[id^=canvas_]").length == 0 ) {                    alert("请先点击获取页面！");                    return;                }
                var images = $("img[id^=img_]");                //alert(isimgComplete(images));                if(!isimgComplete(images)){                    alert("页面尚未提取完，稍后再试");                    return;                }
                var pheight = $("#0").css("height");                var pwidth = $("#0").css("width");                const { jsPDF } = window.jspdf;                const pdf = new jsPDF('p','px',[px2Num(pwidth), px2Num(pheight)]);
                var title = $("title").text().split("|")[1].toString().trim();
                let [imgX, imgY] = [595.28, 841.89];                let imgHeight = imgX / (px2Num(pwidth) / px2Num(pheight));
                $("canvas[id^=canvas_]").each(function(i,e){                    pdf.addImage(document.getElementById('canvas_'+i).toDataURL('image/jpeg'), 'jpeg', 0, 0, px2Num(pwidth), px2Num(pheight), '', 'MEDDIUM');                    //pdf.addImage(document.getElementById('canvas_'+i).toDataURL('image/png'), 'jpeg', 0, 0, imgX, imgHeight, '', 'SLOW');                    pdf.addPage();                });
                let targetPage = pdf.internal.getNumberOfPages();                pdf.deletePage(targetPage); // 删除最后一页
                pdf.save(title + ".pdf");            }
             function downloadPDF0(){                while($("canvas[id^=canvas_]").length < $(".page").length){                    setTimeout(function(){
                    },1000);                }             }

        </script>`;
    let source_img = `        <div id="canvas_container">            <input type="button" value="获取页面" onclick="getPages()"/>            <input type="button" value="下载pdf" onclick="downloadPDF()"/>        </div>        <div id="imgContainer" style="display:none;"><img id="source" src=""></div>        <div id="newimg" width="1190px"></div>        <canvas id="canvas" width="1190px" height="1680px" style="display:none;"></canvas>`;
    //let btn = `<input type="button" value="获取页面" onclick="getPages()"/>               //<input type="button" value="下载pdf" onclick="downloadPDF()"/>`;
    let style = `        <style>            #canvas_container {                position: fixed;                height: 30px;                width: 150px;                top: 50px;                left: 10px;                border: 1px;                /*background-color: #00ff0099;*/                border-radius: 3px;            }        </style>    `;
    $("head").append(style);    $("body").append(source_img);    $("body").append(my_script);    //$("body").append(btn);
    //alert($("title").text());});
})();