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Technical Manual

Manual positioning:
{ let step = 0; // 分阶段控制进度增长速度 if (progress < 20) { step = Math.random() * 0.5; // 前期（连接/下载初始化）极慢 } else if (progress < 70) { step = Math.random() * 2; // 中期（下载文件）中等速度 } else if (progress < 95) { step = Math.random() * 0.8; // 后期（解析渲染）慢 } else { step = Math.random() * 0.2; // 最后5%极慢 } progress += step; if (progress >= 99.9) { progress = 99.9; // 停在99.9%，等PDF真加载完再到100% clearInterval(progressTimer); } // 更新进度条和百分比 const progressPercent = Math.floor(progress); loadingPercentage.textContent = `${progressPercent}%`; progressBar.style.width = `${progressPercent}%`; }, 200); } // 轮询检测PDF是否真的加载完成 function checkPdfReady() { checkPdfReadyTimer = setInterval(() => { try { // 访问iframe内部DOM（同域场景） const iframeDoc = pdfIframe.contentDocument || pdfIframe.contentWindow.document; // pdfjs的页面容器和自带加载条 const pdfContainer = iframeDoc.querySelector('#viewerContainer .page'); const loadingBar = iframeDoc.querySelector('.loadingBar'); // 判定条件：有PDF页面元素且自带加载条消失 if (pdfContainer && !loadingBar) { // 完成最后1%进度 progress = 100; loadingPercentage.textContent = `100%`; progressBar.style.width = `100%`; // 显示"完成"状态 setTimeout(() => { loadingPercentage.innerHTML = 'Finish'; // 延迟隐藏加载卡片 setTimeout(() => { loadingCard.style.opacity = '0'; loadingCard.style.transform = 'scale(0.95)'; loadingCard.style.pointerEvents = 'none'; // 隐藏遮罩层 setTimeout(() => { loadingMask.style.display = 'none'; }, 300); }, 800); }, 500); clearInterval(checkPdfReadyTimer); } } catch (e) { console.log('跨域无法访问iframe内部，进度条将按超时逻辑处理'); } }, 500); } // 启动进度模拟 startProgressSimulation(); // 等iframe加载完（viewer.html）后开始检测PDF状态 pdfIframe.onload = function() { setTimeout(checkPdfReady, 500); }; // 容错：60秒超时处理 setTimeout(() => { if (progress < 100) { progress = 100; loadingPercentage.textContent = `100%`; progressBar.style.width = `100%`; setTimeout(() => { loadingPercentage.innerHTML = '完成'; setTimeout(() => { loadingCard.style.opacity = '0'; loadingCard.style.transform = 'scale(0.95)'; loadingCard.style.pointerEvents = 'none'; setTimeout(() => { loadingMask.style.display = 'none'; }, 300); }, 800); }, 500); clearInterval(progressTimer); clearInterval(checkPdfReadyTimer); } }, 60000); // 60秒超时，可调整