pdfjs-dist 的工作原理：把获取到的 pbf 的文件的数据流， 利用 canvas转换成图片
turnjs 把多个元素做成翻书的特效
我接手了一个展示大屏的项目， 其中有一个地方，就是要以翻书的形式来预览 pdf文件
如图
首先 安装 psfjs-dist
npm install --save pdfjs-dist
turnjs 是jquery的项目， 所以， 我们要在vuejs中安装 jquery
vue中安装jquery的方法
npm install jquery --save
然后在 vue.config.js中配置
module.exports = {
chainWebpack: config => {
config.plugin('provide').use(webpack.ProvidePlugin, [{
$: 'jquery',
jquery: 'jquery',
jQuery: 'jquery',
'window.jQuery': 'jquery'
}])
}
下载trunjs
http://www.turnjs.com/ 官网下载
我写这个笔记的时候， 官网好像下载出错了，我找到了另一种下载的方法
把官网的示例随便打开了个， 找到 上图中的地址
这样也可以得到我们想要的 trunjs库
上面是安装， 下面我们开始使用
<div class="body-content" style="height:850px;"> <v-touch @swipeleft="changeindexleft(1)" @swiperight="changeindexright(1)"> <div id="magazine1" style="height:850px;width:1200px;margin-left:0 !important;"> <!-- 这里的 magazine1 就是翻页组件的容器 --> </div> </v-touch> <!-- 这里的 docview1 是用来存放 pdf转成图片时，所用到的 canvas 标签的--> <div style="margin: 0 auto; text-align: center; display: none"> <div id="docView1" ref="docView1"></div> </div> </div>
代码部份
引入 jquery 和 turnjs
import $ from "jquery"; import * as PDFJS from "pdfjs-dist"; import turn from "../utils/lib/turn.js"
//初始化pdf插件
/*
** @param fileUrl pdf有效的查看地址
** （1、线上地址(如：http://www.xxx.com)
** 2、本地public地址（例如：/static/view.pdf））
** @param pdfPicturePath1 pdf转化的图片地址-用于放大查看所有pdf图片
*/
readPdf(fileUrl,index) {
//这个index 是我代码中要用的， 如果单独使用的话， 可以不要 index 这个参数
let self = this;
let loadingTask1 = PDFJS.getDocument(fileUrl); //读取pdf文件
console.log(loadingTask1, '-----------loadingTask');
loadingTask1.promise
.then(function (pdf) {
if (pdf) {
// pdf 总页数
const pageNum = pdf.numPages;
for (let i = 1; i <= pageNum; i++) {
// 生成每页 pdf 的 canvas
const canvas = document.createElement('canvas');
canvas.id = 'page'+index+'Num' + i;
canvas.className = 'h'+index;
// 将 canvas 添加到 dom 中,docView(存放canvas的div)
let docViewX = "docView"+index;
console.log(docViewX);
self.$refs[docViewX].append(canvas);
//getContext() 方法返回一个用于在画布上绘图的环境。
const context = canvas.getContext('2d');
self.openPage(pdf, i, context);
}
setTimeout(() => {
self.exportImg(self,index);
}, 2000);
}
})
.catch(function (reason) {
console.error('Error: ' + reason);
});
},
//pdf转成canvas
/*
** @param loading pdf生成图片时的加载状态
** @param scale 控制 canvas显示的大小
*/
openPage(pdfFile, pageNumber, context) {
let that = this;
pdfFile.getPage(pageNumber).then(function (page) {
// reference canvas via context
let viewport = page.getViewport({scale:1});
let scale =(847 / viewport.height).toFixed(2) //这里根把自已的项目需求，宽高进行调整
let viewport1 = page.getViewport({scale:scale});
let canvas = context.canvas;
canvas.width = viewport1.width;
canvas.height = viewport1.height;
canvas.style.width = '100%';
canvas.style.height = '100%';
let renderContext = {
canvasContext: context,
viewport: viewport1
};
page.render(renderContext);
that.loading = false;
});
return;
},
//canvas转成图片（可根据具体情况，进行图片转化显示）这里我把所有图片的base64存放在数组里面，方便放大查看，也可以直接把生成图片标签进行图片展示
// 转图片
exportImg(self,index) {
//let canvaslist= document.querySelectorAll('canvas');
let canvaslist = document.getElementsByClassName("h"+index);
let pdfPicturePathX = "pdfPicturePath"+index;
this[pdfPicturePathX] = [];
//这里把所有的图片地址放入到 pdfPicturePath1 数组中去
for (let i = 0; i < canvaslist.length; i++) {
// let canvas = document.getElementById("pageNum" + (i + 1));
// // 将 canvas 转成 base64 格式的图片
// let base64ImgSrc = (canvas as any).toDataURL("image/png")
// const img = document.createElement("img")
// img.setAttribute('class', 'pdf-img');
// img.src = base64ImgSrc
// img.style.width = '100%';
// // 将图片挂载到 dom 中
// (self.$refs as any).docView.append(img);
let canvasNode = document.getElementById('page'+index+'Num' + (i + 1));
// 将 canvas 转成 base64 格式的图片
if(canvasNode){
this[pdfPicturePathX].push({page: i + 1, pic: canvasNode.toDataURL('image/png'), name: i + 1})
}else {
continue;
}
//console.log('--------------aaa-------------', this.pdfPicturePath1);
}
//到上面就是把pdf文件转成 base64格式的图片， 之后把它们存在 pdfPicturePath1的数组中
this.$nextTick(()=>{
if(index == 1){
if($("#magazine1").children().length > 0){
$("#magazine1").turn("destroy");
$("#magazine1").children().remove();
}
let magazine1 = $("#magazine1");
this[pdfPicturePathX].forEach(i=>{
magazine1.append("<img src='"+i.pic+"'/>")
});
//setTimeout(()=>{
$("#magazine1").turn({
autoCenter: true,
elevation: 50,
acceleration: true,
//direction:"rtl",
// when: {
// turned: function() {
// //当前页
// // console.log("Current view: ", $(this).turn("view"));
// // //总页数
// // console.log(
// // "#magazine has " + $("#magazine").turn("pages") + " pages"
// // );
// //$("#magazine").turn("hasPage", 10);
// //$("#magazine").turn("pages", 1);
// }
// }
})
$("#magazine1").turn("center");
$("#magazine1").turn("page");
//console.log($("#magazine1").turn("pages"));
$("#magazine1").bind("start",function(e,p,c){
if(c == "tl"||c == 'tr'){
e.preventDefault();
}
})
//},1000
}
},
下面是我项目的一个完现代码
<template>
<div id="index" ref="appRef">
<div class="bg">
<dv-loading v-show="loading">Loading...</dv-loading>
<div v-show="!loading" class="host-body">
<!-- 第一行-->
<div class="row1">
<div class="title-wrapper">
<img src="../assets/pic_rczs_title1.png">
<fullscreen ref="fullscreen" style="float:right"></fullscreen>
</div>
</div>
<!-- 第二行 -->
<div class="row2">
<div class="item_3">
<div class="picwrapper" v-show="showfengmian1">
<div class="initem" v-if="categoryslist[0]" @click="fengmianclick(1,0)">
<img :src="categoryslist[0].more.thumbnail"/>
<div class="intitle">{{categoryslist[0].name}}</div>
</div>
<div class="initem" v-if="categoryslist[1]" @click="fengmianclick(1,1)">
<img :src="categoryslist[1].more.thumbnail"/>
<div class="intitle">{{categoryslist[1].name}}</div>
</div>
</div>
<div class="detailwrapper" v-show="!showfengmian1">
<div class="dtop">
<img src="../assets/pic_qyzc_shrcxzsy.png"/>
</div>
<div class="btmwrapper">
<div class="left">
<img src="../assets/icon_fanhui.png" @click="backtoshow(1)"/>
</div>
<div class="right">
<div class="content" v-show="!showpdf1">
<div class="listdetailwrapper">
<div class="listtop">
<multiselect v-model="value1"
placeholder="请选择"
open-direction="bottom"
:show-labels="false"
trackBy="id"
label="name"
@select="chooseSelect1"
:options="selectoptions1">
</multiselect>
</div>
<div class="listwrapper">
<div @click="chooselist(1,index,item)" class="listitem" :class="selectItemIndex1 == index?'coloractive':''" v-for="(item,index) in selectList1" :key="item.id">{{item.name}}<span style="float: right" v-if="selectItemIndex1 == index"> 》</span></div>
</div>
</div>
<div class="detail" :style="{height:ispdf1?'':'100%'}">
<div v-if="!ispdf1" class="markdown-body editor" v-html="articleDetail1.post_content"></div>
<div class="img-wrapper" v-if="ispdf1" @click="pdfshowClick(1,articleDetail1.more.files)">
<img class="img1" src="../assets/pic_mrfm_wj@2x.png"/>
</div>
</div>
</div>
<div class="pdf-wrapper" v-show="showpdf1">
<div class="body-content" style="height:850px;">
<v-touch @swipeleft="changeindexleft(1)" @swiperight="changeindexright(1)">
<div id="magazine1" style="height:850px;width:1200px;margin-left:0 !important;">
<!-- <div v-for="(item, index) in pdfPicturePath1" :key="`test_${index}`">-->
<!-- <div>-->
<!-- <v-touch @swipeleft="changeindexleft(1)" @swiperight="changeindexright(1)">-->
<!-- <img :src="item.pic" class="pdf_pic" />-->
<!-- </v-touch>-->
<!-- </div>-->
<!-- </div>-->
</div>
</v-touch>
<div style="margin: 0 auto; text-align: center; display: none">
<div id="docView1" ref="docView1"></div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
<div class="item_3">
<div class="picwrapper" v-show="showfengmian2">
<div class="initem" v-if="categoryslist[2]" @click="fengmianclick(2,2)">
<img :src="categoryslist[2].more.thumbnail"/>
<div class="intitle">{{categoryslist[2].name}}</div>
</div>
<div class="initem" v-if="categoryslist[3]" @click="fengmianclick(2,3)">
<img :src="categoryslist[3].more.thumbnail"/>
<div class="intitle">{{categoryslist[3].name}}</div>
</div>
</div>
<div class="detailwrapper" v-show="!showfengmian2">
<div class="dtop">
<img src="../assets/pic_qyzc_shrcxzsy.png"/>
</div>
<div class="btmwrapper">
<div class="left">
<img src="../assets/icon_fanhui.png" @click="backtoshow(2)"/>
</div>
<div class="right">
<div class="content" v-show="!showpdf2">
<div class="listdetailwrapper">
<div class="listtop">
<multiselect v-model="value2"
placeholder="请选择"
open-direction="bottom"
:show-labels="false"
trackBy="id"
label="name"
@select="chooseSelect2"
:options="selectoptions2">
</multiselect>
</div>
<div class="listwrapper">
<div @click="chooselist(2,index,item)" class="listitem" :class="selectItemIndex2 == index?'coloractive':''" v-for="(item,index) in selectList2" :key="item.id">{{item.name}}<span style="float: right" v-if="selectItemIndex2 == index"> 》</span></div>
</div>
</div>
<div class="detail" :style="{height:ispdf2?'':'100%'}">
<div v-if="!ispdf2" class="markdown-body editor" v-html="articleDetail2.post_content"></div>
<div class="img-wrapper" v-if="ispdf2" @click="pdfshowClick(2,articleDetail2.more.files)">
<img class="img1" src="../assets/pic_mrfm_wj@2x.png"/>
</div>
</div>
</div>
<div class="pdf-wrapper" v-show="showpdf2">
<div class="body-content" style="height:850px;">
<v-touch @swipeleft="changeindexleft(2)" @swiperight="changeindexright(2)">
<div id="magazine2" style="height:850px;width:1200px;margin-left:0 !important;">
<!-- <div v-for="(item, index) in pdfPicturePath2" :key="`test_${index}`">-->
<!-- <div>-->
<!-- <v-touch @swipeleft="changeindexleft(2)" @swiperight="changeindexright(2)">-->
<!-- <img :src="item.pic" class="pdf_pic" />-->
<!-- </v-touch>-->
<!-- </div>-->
<!-- </div>-->
</div>
</v-touch>
<div style="margin: 0 auto; text-align: center; display: none">
<div id="docView2" ref="docView2"></div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
<div class="item_3">
<div class="picwrapper" v-show="showfengmian3">
<div class="initem" v-if="categoryslist[4]" @click="fengmianclick(3,4)">
<img :src="categoryslist[4].more.thumbnail"/>
<div class="intitle">{{categoryslist[4].name}}</div>
</div>
<div class="initem" v-if="categoryslist[5]" @click="fengmianclick(3,5)">
<img :src="categoryslist[5].more.thumbnail"/>
<div class="intitle">{{categoryslist[5].name}}</div>
</div>
</div>
<div class="detailwrapper" v-show="!showfengmian3">
<div class="dtop">
<img src="../assets/pic_qyzc_shrcxzsy.png"/>
</div>
<div class="btmwrapper">
<div class="left">
<img src="../assets/icon_fanhui.png" @click="backtoshow(3)"/>
</div>
<div class="right">
<div class="content" v-show="!showpdf3">
<div class="listdetailwrapper">
<div class="listtop">
<multiselect v-model="value3"
placeholder="请选择"
open-direction="bottom"
:show-labels="false"
trackBy="id"
label="name"
@select="chooseSelect3"
:options="selectoptions3">
</multiselect>
</div>
<div class="listwrapper">
<div @click="chooselist(3,index,item)" class="listitem" :class="selectItemIndex3 == index?'coloractive':''" v-for="(item,index) in selectList3" :key="item.id">{{item.name}}<span style="float: right" v-if="selectItemIndex3 == index"> 》</span></div>
</div>
</div>
<div class="detail" :style="{height:ispdf3?'':'100%'}">
<div v-if="!ispdf3" class="markdown-body editor" v-html="articleDetail3.post_content"></div>
<div class="img-wrapper" v-if="ispdf3" @click="pdfshowClick(3,articleDetail3.more.files)">
<img class="img1" src="../assets/pic_mrfm_wj@2x.png"/>
</div>
</div>
</div>
<div class="pdf-wrapper" v-show="showpdf3">
<div class="body-content" style="height:850px;">
<v-touch @swipeleft="changeindexleft(3)" @swiperight="changeindexright(3)">
<div id="magazine3" style="height:850px;width:1200px;margin-left:0 !important;">
<!-- <div v-for="(item, index) in pdfPicturePath3" :key="`test_${index}`">-->
<!-- <div>-->
<!-- <v-touch @swipeleft="changeindexleft(3)" @swiperight="changeindexright(3)">-->
<!-- <img :src="item.pic" class="pdf_pic" />-->
<!-- </v-touch>-->
<!-- </div>-->
<!-- </div>-->
</div>
</v-touch>
<div style="margin: 0 auto; text-align: center; display: none">
<div id="docView3" ref="docView3"></div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</template>
<script>
import drawMixin from "../utils/drawMixin";
import "github-markdown-css/github-markdown.css"
import fullscreen from "@/views/fullscreen";
import Multiselect from "vue-multiselect";
import $ from "jquery";
import * as PDFJS from "pdfjs-dist";
import turn from "../utils/lib/turn.min.js"
import M from "../model/m";
export default {
mixins: [ drawMixin ],
data() {
return {
categoryslist:[], //首页的分类列表， 一共有六个分类
//下拉选择框 三个
selectoptions1:[
],
selectoptions2:[],
selectoptions3:[],
//下拉选择框的值 三个
value1:{},
value2:{},
value3:{},
//下拉选择后的列表 三个
selectList1:[],
//列表中选中的标记， 主要是为了显示 条目中的小箭头
selectItemIndex1:-1,
selectList2:[],
selectItemIndex2:-2,
selectList3:[],
selectItemIndex3:-3,
//标记pdf记号
ispdf1:false,
ispdf2:false,
ispdf3:false,
//showpdf div的标记
showpdf1:false,
showpdf2:false,
showpdf3:false,
showfengmian1:true,
showfengmian2:true,
showfengmian3:true,
articleDetail1:{},
articleDetail2:{},
articleDetail3:{},
pdfPicturePath1: [], // pdf转化的图片地址
pdfPicturePath2: [], // pdf转化的图片地址
pdfPicturePath3: [], // pdf转化的图片地址
loading:true,
}
},
components: {
fullscreen,
Multiselect
},
computed:{
},
mounted() {
this.initData();
//this.timeFn()
//this.readPdf("bbb.pdf")
this.cancelLoading();
this.$refs.fullscreen.toggleFullScreen();
},
beforeDestroy () {
},
methods: {
chooseSelect1(selectoption){
this.getSelectList(selectoption,1);
},
chooseSelect2(selectoption){
this.getSelectList(selectoption,2);
},
chooseSelect3(selectoption){
this.getSelectList(selectoption,3);
},
initData(){
//得到首页的图片列表
M.getCategorys().then(res=>{
this.categoryslist = res.data.categories;
})
},
//封面被点击
fengmianclick(index,categoryslistindex){
console.log(index,categoryslistindex);
//index 表示是哪一列中的（本屏一共有三列）
//categoryslistindex 被点击的在 categoryslist中的index
let showfengmianX = "showfengmian"+index;
this[showfengmianX] = false;
let thecategory = this.categoryslist[categoryslistindex];
M.getCategorys(thecategory.id).then(res=>{
let selectoptions = res.data.categories;
let selectoptionsX = "selectoptions"+index;
this[selectoptionsX] = selectoptions;
let valueX = "value"+index;
this[valueX] = selectoptions[0];
//这里要显示默认的项的信息
this.getSelectList(selectoptions[0],index);
})
},
getSelectList(value,index){
//index表示第几列的
let params = {
category_id:value.id
}
M.getselectLists(params).then(res=>{
console.log(res);
let selectListX = "selectList"+index;
let selectlist = res.data.map(i=>{
i.name=i.post_title;
if(i.tag == 0){
i.type = "txt"
}else if(i.tag == 1){
i.type = "pdf";
}
return i;
});
this[selectListX] = selectlist;
let selectItemIndexX = "selectItemIndex"+index;
this[selectItemIndexX] = 0;
let theselectItem = selectlist[0];
this.getArticleDetail(theselectItem,index);
})
},
//通过文章id来显示文章的详情
getArticleDetail(theselectItem,index){
//index 第几列
if(!theselectItem){
let articleDetailX = "articleDetail"+index;
this[articleDetailX] = [];
return;
}
let ispdfX = "ispdf"+index;
let article_id = theselectItem.id;
this[ispdfX] = theselectItem.type == "pdf"?true:false
M.getArticleDetail(article_id).then(res=>{
let articleDetailX = "articleDetail"+index;
this[articleDetailX] = res.data;
if(theselectItem.type == "pdf"){
this.readPdf(res.data.more.files[0].url,index);
//this.readPdf("bbb.pdf?"+Math.random(),index)
}
})
},
//回退
backtoshow(index){
//index 表示是哪一列中的（本屏一共有三列）
let showpdfX = "showpdf"+index;
//当 showpdfX == true是 一定是显示了pdf 的滑动页
if(this[showpdfX]){
this[showpdfX] = !this[showpdfX]
}else{
//如果是showpdfX 是 false ,那就应该是退回上一级的页面
let showfengmianX = "showfengmian"+index;
this[showfengmianX] = true;
}
},
pdfshowClick(index,files){
//index 表示是哪一列中的（本屏一共有三列）
let showpdfX = "showpdf"+index;
this[showpdfX] = true;
//是在这里加载pdf ,还是在列表中点击的时候加载pdf 可以测试一下哪个要好一点
//this.readPdf("bbb.pdf",index)
},
chooselist(index,listindex,item){
//第一个index 表示是哪一列中的（本屏一共有三列）
//listindex 表示点击的是哪一条数据
let selectItemIndexX = "selectItemIndex"+index;
this[selectItemIndexX] = listindex;
let selectListX = "selectList"+index;
//从selectListX中的数组中得到这条信息的具体内容，并标记是否是一个pdf文件
//看后台的设计，这里可能是要请求接口的
let ispdfX = "ispdf"+index;
this[ispdfX] = this[selectListX][listindex].type == "pdf"?true:false
this.getArticleDetail(item,index)
},
//书翻页
changeindexleft(index){
this.$nextTick(()=>{
if(index == 1){
$("#magazine1").turn("next")
}else if(index == 2){
$("#magazine2").turn("next")
}else if(index == 3){
$("#magazine3").turn("next")
}
})
},
changeindexright(index){
this.$nextTick(()=>{
if(index == 1){
$("#magazine1").turn("previous")
}else if(index == 2){
$("#magazine2").turn("previous")
}else if(index == 3){
$("#magazine3").turn("previous")
}
})
},
//初始化pdf插件
/*
** @param fileUrl pdf有效的查看地址
** （1、线上地址(如：http://www.xxx.com)
** 2、本地public地址（例如：/static/view.pdf））
** @param pdfPicturePath1 pdf转化的图片地址-用于放大查看所有pdf图片
*/
readPdf(fileUrl,index) {
let self = this;
if(index == 1){
let loadingTask1 = PDFJS.getDocument(fileUrl); //读取pdf文件
console.log(loadingTask1, '-----------loadingTask');
loadingTask1.promise
.then(function (pdf) {
if (pdf) {
// pdf 总页数
const pageNum = pdf.numPages;
for (let i = 1; i <= pageNum; i++) {
// 生成每页 pdf 的 canvas
const canvas = document.createElement('canvas');
canvas.id = 'page'+index+'Num' + i;
canvas.className = 'h'+index;
// 将 canvas 添加到 dom 中,docView(存放canvas的div)
let docViewX = "docView"+index;
console.log(docViewX);
self.$refs[docViewX].append(canvas);
//getContext() 方法返回一个用于在画布上绘图的环境。
const context = canvas.getContext('2d');
self.openPage(pdf, i, context);
}
setTimeout(() => {
self.exportImg(self,index);
}, 2000);
}
})
.catch(function (reason) {
console.error('Error: ' + reason);
});
}
if(index == 2){
let loadingTask2 = PDFJS.getDocument(fileUrl); //读取pdf文件
console.log(loadingTask2, '-----------loadingTask');
loadingTask2.promise
.then(function (pdf) {
if (pdf) {
// pdf 总页数
const pageNum = pdf.numPages;
for (let i = 1; i <= pageNum; i++) {
// 生成每页 pdf 的 canvas
const canvas = document.createElement('canvas');
canvas.id = 'page'+index+'Num' + i;
canvas.className = 'h'+index;
// 将 canvas 添加到 dom 中,docView(存放canvas的div)
let docViewX = "docView"+index;
console.log(docViewX);
self.$refs[docViewX].append(canvas);
//getContext() 方法返回一个用于在画布上绘图的环境。
const context = canvas.getContext('2d');
self.openPage(pdf, i, context);
}
setTimeout(() => {
self.exportImg(self,index);
}, 2000);
}
})
.catch(function (reason) {
console.error('Error: ' + reason);
});
}
if(index == 3){
let loadingTask3 = PDFJS.getDocument(fileUrl); //读取pdf文件
console.log(loadingTask3, '-----------loadingTask');
loadingTask3.promise
.then(function (pdf) {
if (pdf) {
// pdf 总页数
const pageNum = pdf.numPages;
for (let i = 1; i <= pageNum; i++) {
// 生成每页 pdf 的 canvas
const canvas = document.createElement('canvas');
canvas.id = 'page'+index+'Num' + i;
canvas.className = 'h'+index;
// 将 canvas 添加到 dom 中,docView(存放canvas的div)
let docViewX = "docView"+index;
console.log(docViewX);
self.$refs[docViewX].append(canvas);
//getContext() 方法返回一个用于在画布上绘图的环境。
const context = canvas.getContext('2d');
self.openPage(pdf, i, context);
}
setTimeout(() => {
self.exportImg(self,index);
}, 2000);
}
})
.catch(function (reason) {
console.error('Error: ' + reason);
});
}
},
//pdf转成canvas
/*
** @param loading pdf生成图片时的加载状态
** @param scale 控制 canvas显示的大小
** @param pdfPicturePath1 pdf转化的图片地址-用于放大查看所有pdf图片
*/
openPage(pdfFile, pageNumber, context) {
let that = this;
pdfFile.getPage(pageNumber).then(function (page) {
// reference canvas via context
let viewport = page.getViewport({scale:1});
let scale =(847 / viewport.height).toFixed(2)
let viewport1 = page.getViewport({scale:scale});
let canvas = context.canvas;
canvas.width = viewport1.width;
canvas.height = viewport1.height;
canvas.style.width = '100%';
canvas.style.height = '100%';
let renderContext = {
canvasContext: context,
viewport: viewport1
};
page.render(renderContext);
that.loading = false;
});
return;
},
//canvas转成图片（可根据具体情况，进行图片转化显示）这里我把所有图片的base64存放在数组里面，方便放大查看，也可以直接把生成图片标签进行图片展示
// 转图片
exportImg(self,index) {
//let canvaslist= document.querySelectorAll('canvas');
let canvaslist = document.getElementsByClassName("h"+index);
let pdfPicturePathX = "pdfPicturePath"+index;
this[pdfPicturePathX] = [];
//这里把所有的图片地址放入到 pdfPicturePath1 数组中去
for (let i = 0; i < canvaslist.length; i++) {
// let canvas = document.getElementById("pageNum" + (i + 1));
// // 将 canvas 转成 base64 格式的图片
// let base64ImgSrc = (canvas as any).toDataURL("image/png")
// const img = document.createElement("img")
// img.setAttribute('class', 'pdf-img');
// img.src = base64ImgSrc
// img.style.width = '100%';
// // 将图片挂载到 dom 中
// (self.$refs as any).docView.append(img);
let canvasNode = document.getElementById('page'+index+'Num' + (i + 1));
// 将 canvas 转成 base64 格式的图片
if(canvasNode){
this[pdfPicturePathX].push({page: i + 1, pic: canvasNode.toDataURL('image/png'), name: i + 1})
}else {
continue;
}
//console.log('--------------aaa-------------', this.pdfPicturePath1);
}
this.$nextTick(()=>{
if(index == 1){
if($("#magazine1").children().length > 0){
$("#magazine1").turn("destroy");
$("#magazine1").children().remove();
}
let magazine1 = $("#magazine1");
this[pdfPicturePathX].forEach(i=>{
magazine1.append("<img src='"+i.pic+"'/>")
});
//setTimeout(()=>{
$("#magazine1").turn({
autoCenter: true,
elevation: 50,
acceleration: true,
//direction:"rtl",
// when: {
// turned: function() {
// //当前页
// // console.log("Current view: ", $(this).turn("view"));
// // //总页数
// // console.log(
// // "#magazine has " + $("#magazine").turn("pages") + " pages"
// // );
// //$("#magazine").turn("hasPage", 10);
// //$("#magazine").turn("pages", 1);
// }
// }
})
$("#magazine1").turn("center");
$("#magazine1").turn("page");
//console.log($("#magazine1").turn("pages"));
$("#magazine1").bind("start",function(e,p,c){
if(c == "tl"||c == 'tr'){
e.preventDefault();
}
})
//},1000)
}
if(index == 2){
if($("#magazine2").children().length > 0){
$("#magazine2").turn("destroy");
$("#magazine2").children().remove();
}
let magazine2 = $("#magazine2");
this[pdfPicturePathX].forEach(i=>{
magazine2.append("<div><img src='"+i.pic+"'/></div>")
});
$("#magazine2").turn("center");
$("#magazine2").turn("page");
$("#magazine2").turn({
autoCenter: true,
acceleration: true,
//direction:"rtl",
when: {
turned: function() {
//当前页
// console.log("Current view: ", $(this).turn("view"));
// //总页数
// console.log(
// "#magazine has " + $("#magazine").turn("pages") + " pages"
// );
//$("#magazine").turn("hasPage", 10);
//$("#magazine").turn("pages", 1);
}
}
})
$("#magazine2").bind("start",function(e,p,c){
if(c == "tl"||c == 'tr'){
e.preventDefault();
}
})
}
if(index == 3){
if($("#magazine3").children().length > 0){
$("#magazine3").turn("destroy");
$("#magazine3").children().remove();
}
let magazine3 = $("#magazine3");
this[pdfPicturePathX].forEach(i=>{
magazine3.append("<div><img src='"+i.pic+"'/></div>")
});
$("#magazine3").turn("center");
$("#magazine3").turn("page");
$("#magazine3").turn({
autoCenter: true,
acceleration: true,
//direction:"ltr",
when: {
turned: function() {
//当前页
// console.log("Current view: ", $(this).turn("view"));
// //总页数
// console.log(
// "#magazine has " + $("#magazine").turn("pages") + " pages"
// );
//$("#magazine").turn("hasPage", 10);
//$("#magazine").turn("pages", 1);
}
}
})
$("#magazine3").bind("start",function(e,p,c){
if(c == "tl"||c == 'tr'){
e.preventDefault();
}
})
}
})
},
cancelLoading() {
setTimeout(() => {
this.loading = false
}, 500)
}
}
}
</script>
<style src="vue-multiselect/dist/vue-multiselect.min.css"></style>
<style lang="scss" scoped>
@import '../assets/scss/index.scss';
.row1{
margin-top:109px;
.title-wrapper{
position:relative;
padding-left:177px;
&::before{
position:absolute;
left:100px;
top:0;
content:"";
width:20px;
height:226px;
background:#00FBFF;
}
}
}
.row2{
width:100%;
height:1584px;
display:flex;
flex-flow: row nowrap;
justify-content: space-between;
align-items: center;
padding:0 10px;
.item_3{
flex:1;
width:100%;
height:100%;
display:flex;
justify-content: center;
align-items: center;
.picwrapper{
width:100%;
height:1183px;
display:flex;
justify-content: space-between;
align-items: center;
padding:0 50px;
.initem{
width:978px;
height:1183px;
box-shadow: 0 0 10px 10px rgba(255,255,255,.4);
border-radius: 20px;
overflow: hidden;
position: relative;
img{
width:987px;
height:1183px;
border-radius: 20px;
}
.intitle{
position: absolute;
font-size:130px;
font-weight: bold;
bottom:143px;
text-align: center;
width:100%;
color:#fff;
text-shadow:0px 0px 30px #023b92;
letter-spacing: 10px;
}
}
}
.detailwrapper{
width:100%;
height:1370px;
padding:0 50px;
.dtop{
overflow: hidden;
img{
transform: translate(-2%,0);
}
}
.btmwrapper{
display:flex;
width:100%;
height:947px;
margin-top:20px;
.left{
flex-basis: 144px;
img{
position: relative;
top:50%;
transform: translate(0,-50%);
width:100px;
height:100px;
}
}
.right{
flex:1;
box-shadow: rgba(255,255,255,.9) 0 0 20px inset;
padding:50px;
box-sizing: border-box;
display:flex;
justify-content: space-between;
.content{
width:100%;
display:flex;
justify-content: space-between;
align-items: center;
.listdetailwrapper{
width:885px;
height:auto;
.listtop{
width:769px;
::v-deep .multiselect--active{
.multiselect__select{
z-index: 100;
}
.multiselect__input{
color:#fff !important;
}
}
::v-deep .multiselect{
min-height:100px;
font-size: 56px !important;
.multiselect__select{
width: 100px;
height: 100px;
line-height: 76px;
background: #FFDC24;
border-radius: 50px;
margin-top: 10px;
&:before{
border-width: 25px 18px 0;
}
}
.multiselect__tags{
min-height: 100px;
font-size: 56px;
line-height: 100px;
background:#2B6CD2;
.multiselect__input{
min-height:100px;
line-height: 100px;
font-size:56px;
background:#2B6CD2;
color:#fff !important;
}
.multiselect__single{
min-height:100px;
line-height: 100px;
font-size:56px;
background:none;
color:#fff;
}
}
.multiselect__content-wrapper{
max-height: 700px !important;
.multiselect__option{
min-height: 100px;
line-height: 100px;
}
}
}
::v-deep .multiselect__option--highlight{
background:#aaa;
}
}
.listwrapper{
width:100%;
height:720px;
overflow-y:scroll;
-webkit-overflow-scrolling : touch;
&::-webkit-scrollbar { width: 0 !important }
.coloractive{
color:#FFDC24 !important;
}
.listitem{
height:110px;
font-size:56px;
line-height: 110px;
color:#fff;
padding:0 20px;
box-sizing: border-box;
text-overflow: ellipsis;
overflow: hidden;
white-space: nowrap;
width:95%;
span{
font-size:30px;
display: inline-block;
height:110px;
float:right;
line-height: 110px;
color:#FFDC24;
margin-right:40px
}
&:hover{
background:rgba(255,255,255,0.3);
color:#FFDC24
}
}
}
}
.detail{
flex:1;
padding:20px;
box-sizing: border-box;
overflow-y: scroll;
&::-webkit-scrollbar{
width:0;
}
.editor{
background:none;
font-size:50px;
color:#fff;
}
.img-wrapper{
width:500px;
hieght:587px;
margin:0 auto;
background:url("../assets/pic_rczc_ym1.png") no-repeat center right;
.img1{
width:441px;
height:587px;
}
}
}
}
.pdf-wrapper{
width:100%;
display:flex;
justify-content: center;
align-items: center;
.decit{
font-size:56px;
z-index: 1000;
}
}
}
}
}
}
}
</style>
说一下这个项目， 这个项目中使用 turnjs 的时候
只能 倒翻书， 不能正翻书， direction:“rtl”, 只能rtl才生效， 如果是 ltr 就是出错，无效果
后来找到了另外一个解决办法 v-touch 就是解决的办法
首先 禁止掉 turnjs 的翻页效果
//这段代码就是禁止 turnjs 的翻书效果
$("#magazine1").bind("start",function(e,p,c){
if(c == "tl"||c == 'tr'){
e.preventDefault();
}
})
然后， 使用 v-touch 监听 左右滑动
//书翻页
changeindexleft(index){
this.$nextTick(()=>{
if(index == 1){
$("#magazine1").turn("next")
}
})
},
changeindexright(index){
this.$nextTick(()=>{
if(index == 1){
$("#magazine1").turn("previous")
}
})
},
这样书就可以 前后翻动了 解决了 turnjs 只能 倒翻书的问题
还有一个问题， 就是 因为，本页面会加载不同的pdf 文件， 而 turnjs 初始化后 $(“#magazine1”).turn();会在 其中添加很多其它的标记， 如果在 $(“#margazine1”).turn()初始化完成之后 ， 再执行一次 $(“#margazine1”).turn()；就会形成无限的嵌套，导至显示出错。
最初我使用的是 vue 的数据改变来 更改 pdf 图片的显示， 就踩了上面的坑， 后来经过分析， 我在代码中使用了 jquery 的方法来改变数据
上面的代码中
以上便是我使用 vue pdf-dist 和turnjs做翻页的心得
原文地址：https://blog.csdn.net/hjh15827475896/article/details/127609539
