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2024-09-27 02:06:13 +08:00
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101
历届学生/font-end-nine/项目练习/学生项目/张婷/练习/node/PaChong.js Normal file
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const request = require('request');
const iconv = require('iconv-lite');
const cheerio = require('cheerio');
const fs = require('fs');
//网页基地址
var baseUrl = `https://pic.netbian.com`
//网页地址共1034页
//用于存放页面地址(一页一页的下载)
var pageArr = []
var pageIndex = 0
//用于存放详情页地址
var hrefArr = []
var hrefIndex = 0
//循环先爬3页
for (var i = 1; i <= 2; i++) {
if (i == 1) {
pageArr.push(`${baseUrl}/index.html`)
} else {
pageArr.push(`${baseUrl}/index_${i}.html`)
}
}
// console.log("pageArr:", pageArr);
function requestPage() {
//调用getHtml方法请求
getHtml(pageArr[pageIndex], ($) => {
//each遍历（下标，元素）
$(".slist li").each(function (index, element) {
//去除下一页图片（21下一页）总共20张图片
if (!$(this).hasClass("nextpage")) {
// console.log( $(this).find("a").attr("title"));
hrefArr.push(
//attr打印标签属性
//基地址 + 图片地址
`${baseUrl}${$(this).find("a").attr("href")}`
)
}
})
requestInfo()
// console.log("hrefArr:",hrefArr);
})
}
function requestInfo() {
getHtml(hrefArr[hrefIndex], ($) => {
//A 利用request去请求图片地址
request(`${baseUrl}${$(".photo-pic img").attr("src")}`)
//管道符: 将A的数据流入B
.pipe(
//B fs创建写入数据流 //图片命名方式，随机数＋时间戳避免名字重复
fs.createWriteStream(`./img/${ Math.random() * 1000000 + `${Date.now()}` }.jpg`)
)
// console.log(`${baseUrl}${$(".photo-pic img").attr("src")}`);
hrefIndex += 1
if(hrefIndex < hrefArr.length){
requestInfo()
}else{
pageIndex += 1
if(pageIndex < pageArr.length){
requestPage()
}
}
})
}
//每一页和每一页的每个图片，都需要发送请求，所以统一封装一下
function getHtml(url, callback) {
request({
uri: url,
method: 'GET',
encoding: 'binary'
//转码
}, function (error, response, body) {
var str2 = iconv.decode(new Buffer(body, 'binary'), 'gbk');
const $ = cheerio.load(str2)
callback($)
// console.log(str2);
});
}
requestPage()

14
历届学生/font-end-nine/项目练习/学生项目/张婷/练习/node/http.js Normal file
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const http = require('http');
const server = http.createServer((req, res) => {
//手动设值请求头和输出格式等等
res.writeHead(200, { 'Content-Type': 'application/json' });//'Content-Type': 'text/html; charset=UTF-8'
//浏览器输出
res.end(JSON.stringify({
data: 'Hello World!'
}));
});
server.listen(8000);

496
历届学生/font-end-nine/项目练习/学生项目/张婷/练习/node/package-lock.json generated Normal file
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{
"name": "node",
"version": "1.0.0",
"description": "",
"main": "PaChong.js",
"scripts": {
"start": "node-dev PaChong.js"
},
"keywords": [],
"author": "",
"license": "ISC",
"dependencies": {
"axios": "^0.27.2",
"cheerio": "^1.0.0-rc.12",
"iconv-lite": "^0.6.3",
"request": "^2.88.2"
}
}

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服务端渲染
Node.js : js在服务器上的运行环境
V8是Google的开源的JavaScript和WebAssembly引擎，用C++编写。它用于Chrome和Node.js等。
npm ：（命令行工具，是一个软件，nodejs出厂自带）NodeJS包管理和分发工具，已经成为了非官方的发布Node模块（包）的标准。
前端开发三个阶段：
1 html css table [table标签即表格，tr标签是行，th是表格的头，td是列。tr和td需要多少写多少，一行（列）写一个，多行（列）写多个]
2 html + css + js (jquery) 操作dom [http://t.zoukankan.com/liuafan-p-9523773.html]
mvc框架 [MVC开始是存在于桌面程序中的，M是指业务模型，V是指用户界面，C则是控制器，使用MVC的目的是将M和V的实现代码分离，从而使同一个程序可以使用不同的表现形式。比如一批统计数据可以分别用柱状图、饼图来表示。C存在的目的则是确保M和V的同步，一旦M改变，V应该同步更新。]
模型 视图 控制器 m和v代码分离，c控制m和v更新改变同步
3 mvvm框架 （其发展基于node.js的蓬勃发展）
模型 视图 视图模型 控制器 MVVM模式和MVC模式一样，主要目的是分离视图（View）和模型（Model）：
1. 低耦合。视图（View）可以独立于Model变化和修改，一个ViewModel可以绑定到不同的"View"上，当View变化的时候Model可以不变，当Model变化的时候View也可以不变。
2. 可重用性。你可以把一些视图逻辑放在一个ViewModel里面，让很多view重用这段视图逻辑。
3. 独立开发。开发人员可以专注于业务逻辑和数据的开发（ViewModel），设计人员可以专注于页面设计，使用Expression Blend可以很容易设计界面并生成xaml代码。
4. 可测试。界面素来是比较难于测试的，测试可以针对ViewModel来写。
mvvm angular.js [是一个应用设计框架与开发平台，用于创建高效、复杂、精致的单页面应用，通过新的属性和表达式扩展了 HTML，实现一套框架，多种平台，移动端和桌面端。AngularJS有着诸多特性，最为核心的是：MVVM、模块化、自动化双向数据绑定、语义化标签、依赖注入等等。]
react [用于构建用户界面的JavaScript库,主要用于构建UI] 1.声明式设计：React 使创建交互式 UI 变得轻而易举。为你应用的每一个状态设计简洁的视图，当数据变动时 React能高效更新并渲染合适的组件。
2.组件化: 构建管理自身状态的封装组件，然后对其组合以构成复杂的 UI。
3.高效：React通过对DOM的模拟，最大限度地减少与DOM的交互。
4.灵活：无论你现在使用什么技术栈，在无需重写现有代码的前提下，通过引入React来开发新功能。
vue [是一套用于构建用户界面的渐进式JavaScript框架] https://blog.csdn.net/wu246051/article/details/123060620
终端显示：运行————————node 文件名（例：node index.js）
存储插件—————node_modules: 存放项目开发中所有下载的插件
npm： 初始化——————npm init ——————npm init -y(默认生成pack...)————package.json [scripts:运行命令“存储各种命令”，可以放很多个，但最后一个不能有逗号][dependencies:（devDependencies开发阶段）上线阶段的插件依赖 npm i自动寻找并下载所有依赖插件]
运行命令————npm run XXX (运行scripts里的XXX命令) !!如果命令名为start，run可以省略掉 npm start！！
安装插件————npm install XXX（XXX插件名称）————简写：npm i XXX————！！在哪里安装就在哪里打开终端，路径不能错！！（npm下载默认国外，cnpm国内下载）
———— npm install 插件名 参数——————参数：--save（简写：-s）将插件保存到上线阶段dependencies一般情况下默认
--save-dev（简写：-D）将插件保存到开发阶段devDependencies
--g 将插件安装到操作系统全局 [npm i -g node-dev]
全局插件文件夹安装在使用者下方文件
删除插件————npm uninstall 插件名 （package-lock.json本地存储install里插件的下载地址）
安装插件并指定版本————npm install XXX@版本号
插件包括系统自带的和用户下载的，但都要先引入才能使用：const XX = require（“XX”）；
解构赋值：ES6 允许按照一定模式，从数组和对象中提取值，对变量进行赋值，这被称为解构。es6中对变量的赋值遵循一个规则，只要！！左右两边的模式相同，就可以进行合法赋值！！右给左赋值
——————node.js——————
node.js事件循环：web serve接受请求————关闭————服务下一个web请求——————统一放进处理列队，依次处理后返回值
模块间的相互调用： utils.js 和 index.js
导出：module.exports = new utils() 接收：const A = require("./utils"); A.test() utils里面要调用的方法(假装有一个test()方法)
module.exports = new utils() const { test } = require("./utils");
exports.util = new utils() const A = require("./utils"); A.util.test()
fs文件系统：fs.writeFileSync("./生成文件路径"，“文件内容”) Sync：同步 没有则需要回调函数 传参包含callback
var html = fs.readFileSync("./index.html"路径)
http超文本传输协议： const http = require ("http")
res.end(html. .toString())
buffer二进制数据 .toString()buffer转字符串
————————爬虫————————
总共有1034页数，第一页为index 其余一次加1
https://pic.netbian.com/index.html
https://pic.netbian.com/index_2.html
图片地址
小图 https://pic.netbian.com/uploads/allimg/170609/123945-1496983185 6c4d.jpg
大图 https://pic.netbian.com/uploads/allimg/170609/123945-1496983185 ad61.jpg
.each遍历（下标，元素）
attr打印标签属性 例.attr("title")