turn.js异步加载实现翻书效果

/**
 * 电子翻书
 */
//var width = 1080;
//var height = 1680;
 
var width = "10rem";
var height = "15.2rem";
 
window.onload = function () {
 
 //预加载
 //loading(18,1);
 initData();
}
 
function getQueryString(name) {
 var result = window.location.search.match(new RegExp("[\" + name + "=([^\&]+)", "i"));
 if (result == null || result.length < 1) {
  return "";
 }
 return result[1];
}
 
function initData(){
 var book = getQueryString("bookId");
 var count = getQueryString("pageCount");
 loading_img_url = new Array();
 for (var i = 0; i < count; i++) {
 loading_img_url.push((i+1) + ".png");
 }
 var page = getQueryString("pageNum");
 if(!page){
 page =1;
 }
 loading(book,count,page);
}
 
var date_start;
var date_end;
date_start = getNowFormatDate();
//加载图片
var loading_img_url = [];
 
//加载页面
function loading(book,count,page) {
 var numbers = 0;
 var length = loading_img_url.length;
 //var resUrl = ctxStatic+"/modules/intelligentquery/img/3/";
 var resUrl = website + "/lawcase/bookScreenshot" + book + "&page=";
 var jsUrl = ctxStatic+"/modules/front/guide/vertical/";
 var bookId = book;
  var img = new Image();
  img.src = resUrl + page;
  //img.src = resUrl + pageNum + ".png";
  img.onerror = function () {
   numbers += (1 / length) * 100;
  }
  img.onload = function () {
   numbers += (1 / length) * 100;
   $('.number').html(parseInt(numbers) + "%");
   console.log(numbers);
   if (Math.round(numbers)) {
    //$('.number').hide();
    date_end = getNowFormatDate();
    var loading_time = date_end - date_start;
    //预加载图片
    $(function progressbar() {
     //拼接图片
     $('.shade').hide();
     var tagHtml = "";
     var imgUrl = resUrl + page;
     //var imgUrl = resUrl + (pageNum) + ".png";
     if (pageNum == 1) {
      tagHtml += "<div id='first'><img src='"+imgUrl+"' /></div>";
     } else if (pageNum == length) {
      tagHtml += "<div id='first'><img src='"+imgUrl+"' /></div>";
     } else {
      tagHtml += "<div><img src='"+imgUrl+"' /></div>";
     }
     $(".flipbook").append(tagHtml);
     var w = $(".graph").width();
     $(".flipbook-viewport").show();
    });
 
 
    //配置turn.js
    function loadApp() {
     var w = width;
     var h = height;
     $('.flipboox').width(w).height(h);
     $('.flipbook').turn({
      width: w,
      height: h,
      elevation: 50,
      pages: count,
      display: 'single',
      gradients: true,
      autoCenter: true,
      when: {
       turning: function (e, page, view) {
        var total = $(".flipbook").turn("pages");//总页数
        $("#currentPage").html(page);
        $("#pageCount").html("/"+total);
        if (page == 1) {
         $(".btnImg").css("display", "none");
         $(".mark").css("display", "block");
        } else {
         $(".btnImg").css("display", "block");
         $(".mark").css("display", "none");
        }
        if (page == length) {
         $(".nextPage").css("display", "none");
        } else {
         $(".nextPage").css("display", "block");
        }
       },
       turned: function (e, page, view) {
        var total = $(".flipbook").turn("pages");//总页数
        $("#currentPage").html(page);
        $("#pageCount").html("/"+total);
        // 判断翻页按钮点击事件以及状态样式
        if(page >= total){
         $("#next").addClass("btn-invalid").removeAttr('onclick');
        }else{
         $("#next").removeClass("btn-invalid").attr("onclick","next();");
        }
        if(page == 1){
         $("#prev").addClass("btn-invalid").removeAttr('onclick');
         $("#indexPage").css("display","none");
        }else{
         $("#prev").removeClass("btn-invalid").attr("onclick","prev();");
         $("#indexPage").css("display","flex");
        }
       },
       missing: function (e, pages) {
        for (var i = 0; i < pages.length; i++) {
         addPage(pages[i], $(this),bookId);
        }
       }
 
 
      }
     })
  var cpage = getQueryString("pageNum");
  $(".flipbook").turn('page', cpage);
    }
    yepnope({
     test: Modernizr.csstransforms,
     yep: [jsUrl+'js/turn.js'],
     complete: loadApp
    });
   }
  }
}
 
function getNowFormatDate() {
 var date = new Date();
 var seperator1 = "";
 var seperator2 = "";
 var month = date.getMonth() + 1;
 var strDate = date.getDate();
 if (month >= 1 && month <= 9) {
  month = "0" + month;
 }
 if (strDate >= 0 && strDate <= 9) {
  strDate = "0" + strDate;
 }
 var currentdate = date.getFullYear() + seperator1 + month + seperator1 + strDate
  + "" + date.getHours() + seperator2 + date.getMinutes()
  + seperator2 + date.getSeconds();
 return currentdate;
}
 
//异步加载
function addPage(page, book,bookId) {
 //var resUrl = ctxStatic+"/modules/intelligentquery/img/3/";
 var resUrl = website + "/lawcase/bookScreenshot" + bookId + "&page=";
 var imgUrl = resUrl + (page);
 var tagHtml = "";
 if (page == 1) {
  tagHtml += "<div id='first'><img src='"+imgUrl+"' /></div>";
 } else if (page == length) {
  tagHtml += "<div id='end'><img src='"+imgUrl+"' /></div>";
 } else {
  tagHtml += "<div><img src='"+imgUrl+"' /></div>";
 }
 
 // Check if the page is not in the book
 if (!book.turn('hasPage', page)) {
  // Create an element for this page
  var element = $('<div />').html('');
  // Add the page
  book.turn('addPage', element, page);
  element.html(tagHtml);
 }
}

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<c:set var="front" value="${frontPath}${pageContext.request.contextPath}/f"/>
<c:set var="ctxStatic" value="${pageContext.request.contextPath}/static"/>
<c:set var="website" value="${pageContext.request.contextPath}"/>
<!DOCTYPE html>
<html>
<head>
 <meta charset="utf-8">
 <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1"/>
 <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, minimum-scale=1, user-scalable=no">
 <meta name="format-detection" content="telephone=no">
 <meta name="apple-mobile-web-app-capable" content="yes"/>
 <meta name="apple-mobile-web-app-status-bar-style" content="black"/>
 <title>阅读</title>
 <script src="/UploadFiles/2021-04-02/jquery-3.2.1.min.js">

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