first commit

历届学生/font-end-nine/项目练习/学生项目/郑若怡/案例练习/上课练习/7-5/pc/index.js

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+// 引入插件
+
+const request = require('request')
+
+const iconv = require('iconv-lite')
+
+// 把字符串转化为虚拟dom 
+const cheerio = require('cheerio')
+
+const fs = require('fs')
+
+
+// 所有页数数组 主要用来存页面地址 
+var pageArr = []
+
+// 基地址
+var url = 'https://pic.netbian.com'
+
+// 下标
+var pageIndex = 0
+
+// 详情页地址
+var infoArr = []
+var infoIndex = 0
+
+// 生成页面链接
+for (var i = 1; i <= 3; i++) {
+    if (i == 1) {
+        pageArr.push(url)
+    } else {
+        pageArr.push(`${url}/index_${i}.html`)
+    }
+}
+console.log("pageArr: ", pageArr);
+
+function requestPage() {
+    get(pageArr[pageIndex], ($) => {
+        $(".slist li").each(function (index, ele) {
+            // hasClass获取标签类名
+            if (!$(this).hasClass("nextpage")) {//nextpage是下一页所以要排除
+                infoArr.push(
+                    `${url}${$(this).find("a").attr("href")}`
+                )
+            }
+
+        })
+        requestInfo()
+        // console.log("infoArr:", infoArr);
+    })
+
+}
+
+//生成详情页
+function requestInfo() {
+    get(infoArr[infoIndex], ($) => {
+        request(`${url}${$(".photo-pic img").attr("src")}`)
+
+            .pipe(fs.createWriteStream(`./img/${Math.random() * 1000 + `${Date.now()}`}.png`))
+
+        infoIndex += 1
+        if (infoIndex < infoArr.length) {
+            requestInfo()
+        } else {
+            pageIndex += 1
+            if (pageIndex < pageArr.length) {
+                requestPage()
+            }
+
+        }
+    })
+
+
+}
+
+// gbk转换
+function get(url, callback) {
+    request({
+        url: url,
+        method: 'GET',
+        encoding: 'binary'
+    }, function (error, response, body) {
+        var buf = new Buffer(body, 'binary');
+        var str2 = iconv.decode(buf, 'gbk');
+        // console.log(str2);
+
+        // $就是虚拟dom
+        const $ = cheerio.load(str2)
+        // callback把$返回出去
+        callback($)
+    })
+}
+
+requestPage()

历届学生/font-end-nine/项目练习/学生项目/郑若怡/案例练习/上课练习/7-5/pc/package.json

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+{
+  "name": "pc",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "a": "node index.js"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "cheerio": "^1.0.0-rc.12",
+    "fs": "^0.0.1-security",
+    "iconv-lite": "^0.6.3",
+    "request": "^2.88.2"
+  }
+}