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在进行用node搭建服务器时，有需要读取视频的需求，所以自己大概写了一下如何读取视频，也有利于对视频处理的理解。

视频请求路径：/fileUpload/video/测试视频.mp4

代码部分

路由部分：

"use strict";const path = require("path");const fs = require("fs");const Router = require('koa-router');const router = new Router();const routesFun = require('../utils/routesFun');router.get("/fileUpload/video/*.mp4", async (ctx, next) => {
       let uri = decodeURI(ctx.request.url);    uri = uri.substr(uri.lastIndexOf("/")+1);    let filePath = path.resolve(__dirname, "../bigFile/video/"+uri);//根据请求路径与实际路径适当修改    let resHred = routesFun.readFile(ctx.headers.range, filePath);    ctx.type = "video/mp4;charset=utf-8";    ctx.status = resHred.code    ctx.set(resHred.head);    let stream = fs.createReadStream(filePath, resHred.code == 200 ? {
   } : {
    start: resHred.start, end: resHred.end });    stream.pipe(ctx.res);    ctx.respond = false;    return;});

视频流处理部分：

"use strict";const path = require("path");const fs = require("fs");//mime类型const mime = {
   	"css": "text/css",	"gif": "image/gif",	"html": "text/html",	"ico": "image/x-icon",	"jpeg": "image/jpeg",	"jpg": "image/jpeg",	"js": "text/javascript",	"json": "application/json",	"pdf": "application/pdf",	"png": "image/png",	"svg": "image/svg+xml",	"swf": "application/x-shockwave-flash",	"tiff": "image/tiff",	"txt": "text/plain",	"mp3": "audio/mp3",	"wav": "audio/x-wav",	"wma": "audio/x-ms-wma",	"wmv": "video/x-ms-wmv",	"xml": "text/xml",	"mp4": "video/mp4"};/** * [读文件] * @param  {String} range        [数据起始位] * @param  {String} filePath     [文件路径] * @param  {Number} chunkSize    [每次请求碎片大小 （1MB 左右）] */function readFile(range, filePath, chunkSize = 499999 * 2) {
       // 获取后缀名    let ext = path.extname(filePath);    ext = ext ? ext.slice(1) : "unknown";    //未知的类型一律用"text/plain"类型    let contentType = mime[ext.toLowerCase()];    //建立流对象，读文件    let stat = fs.statSync(filePath)    let fileSize = stat.size;    let head = {
           code: 206,        head: {
               "Content-Length": fileSize,            "content-type": contentType,            "Content-Encoding": "identity"        }    };    if (range) {
           // 大文件分片        let parts = range.replace(/bytes=/, "").split("-");        // console.log(parts)        let start = parseInt(parts[0], 10);        let end = parts[1] ? parseInt(parts[1], 10) : start + chunkSize;        end = end > fileSize - 1 ? fileSize - 1 : end;        chunkSize = (end - start) + 1;        head = {
               code: 206,            filePath,            start,            end,            head: {
                   "Content-Range": `bytes ${
     start}-${
     end}/${
     fileSize}`,                "content-type": contentType,                "Content-Length": chunkSize,                "Accept-Ranges": "bytes",                "Content-Encoding": "identity"            }        }     }    return head;}

问题

现在按照上面写的，暂时发现的错误就是：

1. 安卓手机用微信自带浏览器打开网页进行视频播放时，视频进度条拖动无效，经发现微信自带浏览器进行视频播放时并未经过我所写的路由。所以会有部分问题。暂时不知道如何解决！

有问题或者有错误可以留言，谢谢指导！

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