添加字幕滚动代码（lyric）

lyric/index.js

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+const fs = require('fs');
+const path = require('path');
+const iconv = require('iconv-lite');//安装第三方库转换编码格式
+const readline = require('readline');
+const chalk = require('chalk')
+
+// var filename = path.join(__dirname, './../lyrics/晴天.lrc');
+var filename = path.join(__dirname, './lyric.lrc');
+var streamReader = fs.createReadStream(filename).pipe(iconv.decodeStream('utf8')) // gbk
+
+console.clear();
+playMusic();
+setTimeout(main, 2600); // 音频加载时间
+function main() {
+    // 利用readline读取
+    var rl = readline.createInterface({ input: streamReader });
+    var begin = new Date().getTime();
+    rl.on('line', (line) => {
+        task(line, begin);
+    });
+}
+
+var displayLyric = [], index = 0;
+var regex = /\[(\d{2})\:(\d{2})\.(\d{2,3})\][ ]*(.+)[ ]*/;
+function task(line, begin) {
+    var matches = regex.exec(line);
+    if (matches) {
+        var m = parseFloat(matches[1]);
+        var s = parseFloat(matches[2]);
+        var f = parseFloat(matches[3]);
+        var lyric = matches[4];
+        displayLyric.push(lyric);
+        var offset = new Date().getTime() - begin;
+        setTimeout(() => {
+            console.clear();
+            console.log(chalk.dim(displayLyric[index - 2] || ""));
+            console.log(chalk.hex('#b3b3b3').visible(displayLyric[index - 1] || ""));
+            console.log(chalk.hex('#FFFFFF').bold(displayLyric[index]));
+            console.log(chalk.hex('#b3b3b3').visible(displayLyric[index + 1] || ""));
+            console.log(chalk.dim(displayLyric[index + 2] || ""));
+            index++;
+            // console.log(lyric);
+        }, m * 60 * 1000 + s * 1000 + f - offset);
+    } else {
+        // 不是一行歌词
+        // console.log("err", line);
+    }
+}
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+function playMusic() {
+    var player = require('play-sound')(opts = {})
+    player.play('./music.m4a', function (err) {
+        if (err) throw err;
+        console.log("消愁 - 毛不易");
+    });
+}