【Javascript】应用一：图片，视频，编码相关-Aet

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const fs = require('fs')

function img2base64(path) {

const buffer = fs.readFileSync(path);

const mimetype = get_mime_type(path);

return `data:${mimetype};base64,${buffer.toString('base64')}`;

}

function get_mime_type(path) {

const ext = path.split('.').pop().toLowerCase();

return {

jpg: 'image/jpeg',

png: 'image/png',

gif: 'image/gif',

}[ext] || 'application/octet-stream';

}

function test() {

const basestr = img2base64("d:\\code_test\\js\\tree.jpg")

fs.writeFileSync("d:\\code_test\\js\\new.txt", basestr);

}

test();

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data:image/jpeg;base64,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

// 省去若干数据

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

// 省去若干数据

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const fs = require('fs');

const base64str = "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

// 省去若干数据

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"

// 去除头部信息

const cleanBase64 = base64str.split(',')[1] || base64str;

const buffer = Buffer.from(cleanBase64, 'base64');

fs.writeFileSync('output.jpg', buffer);

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const fs = require('fs');

const base64str = "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

//省去若干数据

// 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"

// 去除头部信息

const cleanBase64 = base64str.split(',')[1] || base64str;

const buffer = Buffer.from(cleanBase64, 'base64');

fs.writeFileSync('trees.mp4', buffer);

概述

`png-base64`

实现

生成结果

有效数据

`base64-png`

实现

`base64-mp4`

实现

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