問題描述

const koa = require(’koa’);const request = require(’request’);const fs = require(’fs’);const path = require(’path’);function requestAsync(url) { return new Promise((resolve, reject) => {request({ url: url}, (err, res, body) => { if (err) {reject(err); } else {resolve(body); }}) });}function writeFileAsync(path, data, option) { return new Promise((resolve, reject) => {fs.writeFile(path, data, option, (err)=> { if (err) {reject(err); } else {resolve(); }}) });}const app = new koa();app.use(async (ctx) => { let url = ’http://pubimage.360doc.com/index7/bannerl_1.jpg’; let filepath = path.join(__dirname, ’./images/詳情’); filepath = filepath + ’/1.jpg’; // request(url).pipe(fs.createWriteStream(filepath));這個(gè)可以正常抓取圖片 let data = await requestAsync(url); let buffer = Buffer.from(data); await writeFileAsync(filepath, buffer); ctx.type = ’jpg’; ctx.body = buffer;})app.listen(3000);console.log(`starting at ${3000}`);

我把request 和 writefile 都寫成了promise的形式，抓取html是可以的，抓取圖片就不行了

一開始data 輸出是string類型，也就是request 的body是string類型，我就使用Buffer.from

轉(zhuǎn)為buffer類型，也是不行，改為Buffer.from(data, ’base64’)也是不行，但就是使用 request(url).pipe(fs.createWriteStream(filepath))就可以請(qǐng)問一下哪里出錯(cuò)了

問題解答

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