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以最优惠的价格买到最心仪的书
Ajankohdalta
// ==UserScript==
// @name Douban Book Bar
// @namespace DoubanBookBar
// @license MIT License
// @author ElvisKang<elviskang@foxmail.com>
// @description 以最优惠的价格买到最心仪的书
// @include *://www.amazon.cn/*
// @include *://item.jd.com/*
// @include *://product.dangdang.com/*
// @include *://product.china-pub.com/*
// @include *://product.suning.com/*
// @include *://www.suning.com/emall/*
// @include *://www.duokan.com/book/*
// @include *://www.winxuan.com/product/*
// @version ver 1.2.10
// @grant GM_xmlhttpRequest
// @grant GM_addStyle
// ==/UserScript==
//用于解决greasemonkey在iframe中运行的问题,避免脚本多次运行
if ( window.top === window.self ) {
(function () {
"use strict";
//全局变量(构造函数)声明区
//包含支持的网站列表以及当前网站对象
var sitesContainer = {
//以下划线开头的属性为访问器属性
_siteList : [], //插件支持的网页
_curSite : null, //当前网页
_siteNameList : [],
addSites : function (sitesArray) {
if ( Array.isArray ( sitesArray ) ) {
this._siteList = this.list.concat ( sitesArray );
var that = this;
sitesArray.forEach ( function (value) {
that.nameList.push ( value.name );
} );
}
},
get list () {
return this._siteList;
},
get nameList () {
return this._siteNameList;
},
get curSite () {
return this._curSite;
},
set curSite (href) {
//通过对象中的checker属性匹配网站
var i,
len = this.list.length;
for ( i = 0 ; i < len ; i++ ) {
var checker = this.list[i].checker;
if ( checker.test && checker.test ( href ) ) {
this._curSite = this.list[i];
}
}
}
};
function SupportSite (siteInfo) {
if ( typeof siteInfo === "object" ) {
for ( var props in siteInfo ) {
if ( siteInfo.hasOwnProperty ( props ) ) {
this[props] = siteInfo[props];
}
}
}
}
SupportSite.prototype.createDoubanBar = function (bookInfo, priceList) {
var insertPosition = document.querySelector ( this.insertPosition );
if ( !insertPosition ) {
log ( "-Error: 网页发生变动，插入位置没有找到" );
return;
}
var infoRowContainer = createInfoRowContainer (),
priceRowContainer = createPriceRowContainer ();
var scoreSpan = createScoreSpan ( bookInfo ),
contrastPriceInfo = createContrastPriceInfo ( priceList );
priceRowContainer.appendChild ( contrastPriceInfo );
infoRowContainer.appendChild ( scoreSpan );
setBaseCss ();
var bar = createBar ( infoRowContainer, priceRowContainer );
insertBar ( bar, insertPosition );
};
var Amazon = new SupportSite ( {
name : "亚马逊",
checker : /(https?:\/\/)?(www)?\.amazon\.(com|cn)\/.*/,
logo : "http://www.amazon.cn/favicon.ico",
getISBN : function () {
var contents = document.querySelectorAll ( "div.content b" );
for ( var i = 0 ; i <= contents.length ; i++ ) {
var info = contents[i];
if ( info && info.textContent === "ISBN:" ) {
return info.nextSibling.data.split ( "," )[0].substring ( 1 );
}
}
},
insertPosition : "#tmmSwatches"
} );
var JD = new SupportSite ( {
name : "京东商城",
checker : /(https?:\/\/)?(www|item)?\.jd\.com\/.*/,
logo : "http://www.jd.com/favicon.ico",
getISBN : function () {
var liContent = document.querySelector ( "#parameter2 > li:nth-child(2)" ).innerHTML;
if(liContent.match(/^ISBN/) !== null) {
return liContent.split ( "：" )[1];
}
return null;
},
insertPosition : "#summary-price"
} );
var Dangdang = new SupportSite ( {
name : "当当网",
checker : /(https?:\/\/)?(www|product)?\.dangdang\.com\/.*/,
logo : "http://www.dangdang.com/favicon.ico",
getISBN : function () {
var scanItems = document.querySelectorAll ( "div.show_info_left" );
for ( var i = 0 ; i < scanItems.length ; i++ ) {
if ( scanItems[i].textContent === "ＩＳＢＮ" || scanItems[i].textContent === "ISBN" ) {
return scanItems[i].nextElementSibling.innerHTML;
}
}
},
insertPosition : ".head"
} );
var Chinapub = new SupportSite ( {
name : "China-pub",
checker : /(https?:\/\/)?(product|www)\.china\-pub\.com\/.*/,
logo : "http://www.china-pub.com/favicon.ico",
getISBN : function () {
var list = document.querySelectorAll ( "#con_a_1 li" );
for ( var i = 0 ; i < list.length ; i++ ) {
if ( list[i].innerHTML.split ( "：" )[0] === "ISBN" ) {
return list[i].innerHTML.split ( "：" )[1].replace ( /<.*?>/g, "" ).match ( /[0-9]*/g ).join ( "" );
}
}
},
insertPosition : ".pro_buy_star"
} );
var Suning = new SupportSite ( {
name : "苏宁易购",
checker : /(https?:\/\/)?(product)\.suning\.com\/.*/,
logo : "http://www.suning.com/favicon.ico",
getISBN : function () {
var isbn = document.querySelector ( "#bookParameterField > dl:nth-child(4) > dd:nth-child(2)" );
return isbn.innerHTML;
},
insertPosition : "#existPrice"
} );
//苏宁第三方(文轩等)
var SuningThird = new SupportSite ( {
name : "苏宁易购第三方",
checker : /(https?:\/\/)?(www)?\.suning\.com\/emall\/.*/,
logo : "http://www.suning.com/favicon.ico",
getISBN : function () {
var isbn = document.querySelector ( "li.li-b:nth-child(11) > span:nth-child(2)" );
return isbn.innerHTML;
},
insertPosition : "#productInfoUl"
} );
var WinXuan = new SupportSite ( {
name : "文轩网",
checker : /(https?:\/\/)?(www)\.winxuan\.com\/.*/,
logo : "http://www.winxuan.com/favicon.ico",
insertPosition : "div.name:nth-child(1)",
getISBN : function () {
var contents = document.querySelectorAll ( ".list-text-3>li" );
//目前文轩网的ISBN位于列表的最后一项，考虑到以后的位置可能发生改变，所以从后往前遍历列表
var i = contents.length ;
for ( ; i-- ; ) {
var text = contents[i].textContent;
var textChecker = /^I S B N：/;
if ( text && textChecker.test(text) ) {
return text.split ( "：" )[1];
}
}
}
} );
var DuoKan = new SupportSite ( {
name : "多看阅读",
isEBook : true,
checker : /(https?:\/\/)?(www)\.duokan\.com\/.*/,
logo : "http://www.duokan.com/favicon.ico",
getISBN : function () {
var isbn = document.querySelector ( "span.isbn" );
return isbn.innerHTML;
},
insertPosition : "div[itemprop=aggregateRating]"
} );
//全局函数声明区
function log (msg) {
console.log ( "DoubanBookBar: " + msg );
}
//调用API设置比价栏的CSS属性
function setBaseCss () {
var baseCSS = [
"#bookbar-container a {color:#228A31 !important;text-decoration:none;font-size: 13px;}",
"#bookbar-container .bookbar-title {font-size: 14px;width:70px;}",
"#bookbar-container span {margin-right: 5px;display: inline-block;font-size: 13px;font-weight: bold;}",
"#bookbar-container ul {padding-left: 0;margin: 4px 0;}",
"#bookbar-container li {list-style: none none outside; display: inline;padding: 0 4px;}",
"#bookbar-container img{ height:16px; width:16px;}",
"#avgScore {color:#DC0000 !important;}"
].join ( "" );
GM_addStyle ( baseCSS );
}
// create* ----生成比价栏相关的函数
//创建比价栏的调用控制函数在SupportSite对象的原型链中
//星级信息
function createStarSpan (score) {
var starSpan = document.createElement ( "span" );
starSpan.id = "bookbar-star";
var bgPosition = "0 " + (-14) * (10 - Math.floor ( parseFloat ( score ) + 0.8 )) + "px";
var starSpanCSS = [
"#bookbar-star { ",
"background :url(http://img3.douban.com/f/book/86fa85a1fe1a9cf55b804c871cc7a79a73f6bf73/pics/bigstars.gif) no-repeat scroll " + bgPosition + " ; ",
"width:75px; height: 14px; position: relative; top: 1px;}"
].join ( "" );
GM_addStyle ( starSpanCSS );
return starSpan;
}
//得分与评价信息
function createScoreSpan (bookInfo) {
var bookID = bookInfo.id,
bookRating = bookInfo.rating || {},
numRaters = bookRating.numRaters,
averageScore = bookRating.average;
var scoreSpan = document.createElement ( "span" ),
infoUl = document.createElement ( "ul" ),
commentsLink = document.createElement ( "li" ),
bookInfoLink = document.createElement ( "li" );
if ( numRaters === 0 ) {
commentsLink.innerHTML = "<span>没有人评价这本书</span>";
} else if ( numRaters < 10 ) {
commentsLink.innerHTML = "<span>少于10人评价这本书</span>";
} else if ( numRaters >= 10 ) {
commentsLink.innerHTML = '<a href="http://book.douban.com/subject/' + bookID + '/collections" target="_blank">(共' + numRaters + '人评价)</a>';
} else {
//获取信息出现错误
commentsLink.innerHTML = "";
}
if ( commentsLink.innerHTML !== "" ) {
var avgLi = document.createElement ( "li" ),
starLi = document.createElement ( "li" ),
starSpan = createStarSpan ( averageScore );
avgLi.innerHTML = '<span>' + averageScore + '</span>';
avgLi.id = "avgScore";
starLi.appendChild ( starSpan );
infoUl.appendChild ( avgLi );
bookInfoLink.innerHTML = '<a href="http://book.douban.com/subject/' + bookID + '/" target="_blank" >(去豆瓣看这本书)</a>';
infoUl.appendChild ( starLi );
infoUl.appendChild ( commentsLink );
} else {
bookInfoLink.innerHTML = '<a href="http://book.douban.com" target="_blank">没在豆瓣找到这本书,去豆瓣逛逛?</a>';
}
infoUl.appendChild ( bookInfoLink );
scoreSpan.appendChild ( infoUl );
return scoreSpan;
}
//由 createContrastPriceInfo 函数调用
//生成每一个价格<li>标签
function createPriceLi (iconLink, priceData, sitePrice) {
var priceLi = document.createElement ( "li" ),
link = document.createElement ( "a" ),
img = document.createElement ( "img" );
img.src = iconLink;
link.href = priceData.href || "#";
link.target = "_blank";
if ( priceData.price === undefined ) {
link.textContent = "[没找到]";
} else {
link.textContent = "￥" + priceData.price;
if ( sitePrice !== -1 ) {
var difference = parseFloat ( priceData.price ) - parseFloat ( sitePrice );
var sgn = difference > 0 ? "+" : "";
link.textContent += "( " + sgn + difference.toFixed ( 2 ) + " )";
}
}
priceLi.appendChild ( img );
priceLi.appendChild ( link );
return priceLi;
}
//价格(其他网站)信息
function createContrastPriceInfo (priceList) {
var contrastPriceInfo = document.createElement ( "span" ),
infoContainer = document.createElement ( "ul" );
if ( priceList.length === 0 ) {
contrastPriceInfo.innerHTML = "<span>豆瓣上没有购买信息</span>";
} else {
for ( var i = 0, len = priceList.length ; i < len ; i++ ) {
var matchIndex = sitesContainer.nameList.indexOf ( priceList[i].name );
var priceLi = createPriceLi ( sitesContainer.list[matchIndex].logo, priceList[i], priceList.curSitePrice );
infoContainer.appendChild ( priceLi );
}
}
contrastPriceInfo.appendChild ( infoContainer );
return contrastPriceInfo;
}
function createBar (infoRow, priceRow) {
var bar = document.createElement ( "div" );
bar.id = "bookbar-container";
bar.appendChild ( infoRow );
bar.appendChild ( priceRow );
return bar;
}
function createPriceRowContainer () {
var container = document.createElement ( "div" ),
label = document.createElement ( "span" );
container.id = "bookbar-priceInfo";
label.innerHTML = "比价:";
label.className = "bookbar-title";
container.appendChild ( label );
return container;
}
function createInfoRowContainer () {
var container = document.createElement ( "div" ),
label = document.createElement ( "span" );
container.id = "bookbar-doubanInfo";
label.className = "bookbar-title";
label.innerHTML = "豆瓣评分:";
container.appendChild ( label );
return container;
}
function insertBar (bar, position) {
var parent = position.parentNode;
if ( parent.lastChild === position ) {
parent.appendChild ( bar );
}
else {
parent.insertBefore ( bar, position.nextSibling );
}
}
// 获取书籍信息
function getBookInfo (isbn) {
if ( !isbn ) {
return null;
}
GM_xmlhttpRequest ( {
method : "get",
url : "http://api.douban.com/v2/book/isbn/" + isbn,
onload : function (result) {
var bookInfo = JSON.parse ( result.responseText );
getBookPrice ( bookInfo );
},
onerror : function (result) {
log ( "-Error:获取书籍信息失败" );
}
} );
}
function getBookPrice (bookInfo) {
var doubanID = bookInfo.id || null;
var doubanLink = "http://book.douban.com/subject/" + doubanID + "/buylinks";
var priceList = [];
GM_xmlhttpRequest ( {
method : "get",
url : doubanLink,
onload : function (result) {
var container = document.createElement ( "div" );
container.innerHTML = result.responseText;
var list = document.evaluate ( '//table[@id="buylink-table"]/tbody/tr', container, null, XPathResult.UNORDERED_NODE_SNAPSHOT_TYPE, null );
var priceChecker = /[0-9]+(\.[0-9]+)?/;
var curSitePrice = -1;
for ( var i = 1, len = list.snapshotLength ; i < len ; i++ ) {
var part = list.snapshotItem ( i );
var link_info = part.querySelectorAll ( "td.pl2" );
var siteName = link_info[0].textContent.trim ();
if ( sitesContainer.nameList.indexOf ( siteName ) !== -1 ) {
if ( siteName === sitesContainer.curSite.name ) {
curSitePrice = priceChecker.exec ( link_info[1].textContent.trim () )[0];
} else {
var priceInfo = {
"name" : siteName,
"href" : link_info[0].getElementsByTagName ( "a" )[0].href,
"price" : priceChecker.exec ( link_info[1].textContent.trim () )[0]
};
priceList.push ( priceInfo );
}
priceList.curSitePrice = curSitePrice; // 如果为-1，则说明没有获得当前网页的书本价格
}
}
sitesContainer.curSite.createDoubanBar ( bookInfo, priceList );
},
onerror : function (result) {
log ( "-Error:获取书籍价格失败" );
}
} );
}
function run () {
sitesContainer.addSites ( [Amazon, JD, Dangdang, Chinapub, Suning, SuningThird, DuoKan,WinXuan] );
sitesContainer.curSite = location.href;
if ( !sitesContainer.curSite ) {
log ( "-Error: 不支持当前的页面" );
return;
}
var isbn = sitesContainer.curSite.getISBN ();
if ( !isbn ) {
log ( "-Error: 无法获取ISBN" );
return;
} else {
log ( "-Success: 成功获取ISBN" );
//异步调用的Ajax ,所以之后需要调用的函数都封装到ajax当中
getBookInfo ( isbn );
}
}
//代码执行区
run ();
}) ();
}