diff --git a/.DS_Store b/.DS_Store
index de4edc7..784cf34 100644
Binary files a/.DS_Store and b/.DS_Store differ
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..adda1b6
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+extract_from_ass_subtitle/node_modules
+extract_from_ass_subtitle/package-lock.json
diff --git a/extract_from_ass_subtitle/.DS_Store b/extract_from_ass_subtitle/.DS_Store
new file mode 100644
index 0000000..5008ddf
Binary files /dev/null and b/extract_from_ass_subtitle/.DS_Store differ
diff --git a/extract_from_ass_subtitle/2. extract_head.js b/extract_from_ass_subtitle/2. extract_head.js
new file mode 100644
index 0000000..6b747ab
--- /dev/null
+++ b/extract_from_ass_subtitle/2. extract_head.js	
@@ -0,0 +1,97 @@
+const assParser = require('ass-parser');
+const fs = require('fs');
+const common = require('./common.js');
+const path = require('path')
+
+/*
+1. 是什么：
+  从 .ass 字幕文件中提取片头文字（共2行字幕）
+  仅针对 [计算机科学速成课] Crash Course Computer Science
+
+2. 如何使用：
+  node 2.\ extract_head.js
+
+3. 备注：
+  所有40集 ass 字幕文件，要和这个脚本放到同一个目录下
+  文件命名必须类似：1. 计算机早期历史-Early Computing.ass
+  1. 开头
+  .ass 结尾
+  因为我们要按顺序读取
+
+  代码是半夜2点写的，目的是快速 hack 出来，
+  所以有些代码不是最“高效”的（比如循环很多次）就不要吐槽啦，管用就好
+*/
+
+var result = '' // 存临时结果
+var final_result = ''; // 存最终结果
+
+var folder = '/Users/remote_edit/Desktop/ass/'
+
+// 循环当前目录下的 ass 文件，按 1，2，3，4...一直到 40 这样的顺序
+function loop_current_folder_ass_file_in_order(){
+  fs.readdir(folder, (err, files) => {
+    for (var i = 1; i <= 40; i++) {     // 40*40(files)=1600 loop, I know.. I know.. not the most ‘efficient’ code, but it's good enough
+      files.forEach(file => {           // file == 1. 计算机早期历史-Early Computing.ass
+        var number = file.split('.')[0] // number == 1
+        var ext = path.extname(file);   // ext == ass
+        if (parseInt(number) === i && ext === '.ass'){
+          extract_main_point(file, number);
+        }
+      });
+    }
+  })
+}
+
+// 抽取重点出来，那两行字幕的样式在全部40集中都是统一的，叫'备注 - 主题'和'这一集的名字'
+function extract_main_point(file, number){
+  var text = fs.readFileSync(file,'utf8')
+  data = assParser(text);
+  body = data[3]['body'];
+
+  for (var i = 0; i <= body.length-1; i++) {
+    var element = body[i];
+    if (element.key == 'Dialogue') {
+      if (element.value.Style == '这一集的名字'){
+        var text = element.value.Text;
+        text = common.remove_curly_brace_keep_text(text);
+        // console.log(text);
+        result = result + '## ' + text + '\n';
+      }
+    }
+  }
+
+  for (var i = 0; i <= body.length-1; i++) {
+    var element = body[i];
+    if (element.key == 'Dialogue') {
+      if (element.value.Style == '备注 - 主题'){
+        var text = element.value.Text;
+        text = common.remove_curly_brace_keep_text(text);
+        // console.log(text);
+        result = result + text.replace(/\\N/g, '\n') + '\n\n\n';
+      }
+    }
+  }
+
+
+  // 如果到了最后一集
+  if (number == 40){
+    // 清理两边空格（trim)，然后末尾加俩空格作为 markdown 换行
+    var line_array = result.split('\n');
+    line_array.forEach(l => {
+      final_result = final_result + l.trim() + '  ' + '\n';
+    })
+    // 处理 HTML entity
+    final_result = common.convertHTML(final_result);
+    // 写文件
+    fs.writeFile("CS_40episode_point.md", final_result, function(err) {
+        if(err) {
+            return console.log(err);
+        }
+        console.log("The file was saved!");
+    });
+  }
+}
+
+// =============
+
+loop_current_folder_ass_file_in_order();
diff --git a/extract_from_ass_subtitle/3. extract_ass_to_txt.js b/extract_from_ass_subtitle/3. extract_ass_to_txt.js
new file mode 100644
index 0000000..3e23f27
--- /dev/null
+++ b/extract_from_ass_subtitle/3. extract_ass_to_txt.js	
@@ -0,0 +1,65 @@
+const assParser = require('ass-parser');
+const fs = require('fs');
+const common = require('./common.js');
+const path = require('path')
+
+var result = ''
+
+var folder = '/Users/remote_edit/Desktop/ass/'
+
+function loop_current_folder_ass_file_in_order(){
+  fs.readdir(folder, (err, files) => {
+    for (var i = 1; i <= 40; i++) {     // 40*40(files)=1600 loop, I know.. I know.. not the most ‘efficient’ code, but it's good enough
+      files.forEach(file => {           // file == 1. 计算机早期历史-Early Computing.ass
+        var number = file.split('.')[0] // number == 1
+        var ext = path.extname(file);   // ext == ass
+        if (parseInt(number) === i && ext === '.ass'){
+          extract_main_point(folder+file, number);
+          // console.log(file);
+        }
+      });
+    }
+  })
+}
+
+
+function extract_main_point(file, number){
+  var text = fs.readFileSync(file,'utf8')
+  data = assParser(text);
+  body = data[3]['body'];
+
+  for (var i = 0; i <= body.length-1; i++) {
+    var element = body[i];
+    if (element.key == 'Dialogue') {
+      if (element.value.Style == 'en - 白色'){
+        var text = element.value.Text;
+        text = common.remove_curly_brace_keep_text(text);
+        result = result + text.trim() + '\n';
+      }
+    }
+  }
+
+  for (var i = 0; i <= body.length-1; i++) {
+    var element = body[i];
+    if (element.key == 'Dialogue') {
+      if (element.value.Style == 'zh - 黄色'){
+        var text = element.value.Text;
+        text = common.remove_curly_brace_keep_text(text);
+        result = result + text.trim() + '\n';
+      }
+    }
+  }
+
+  // 写文件
+  fs.writeFile(file+'.txt', result, function(err) {
+      if(err) {
+          return console.log(err);
+      }
+      console.log("The file was saved!");
+  });
+  result = '';
+}
+
+// =============
+
+loop_current_folder_ass_file_in_order();
diff --git a/extract_from_ass_subtitle/common.js b/extract_from_ass_subtitle/common.js
new file mode 100644
index 0000000..3b12f75
--- /dev/null
+++ b/extract_from_ass_subtitle/common.js
@@ -0,0 +1,25 @@
+// Remove all {}
+// Input: "{\c&HCC9933&}Subtitles by {\c\c&HFFFFFF &}MemoryOnSmells{\c} {\c&HCC9933&}Exclusive for http://UKsubtitles.ru{\c}"
+// Output: "Subtitles by MemoryOnSmells  Exclusive for http://UKsubtitles.ru"
+function remove_curly_brace_keep_text(str) {
+  return str.replace(/\s*\{.*?\}\s*/g, ' ').trim();
+}
+
+function convertHTML(str) {
+    var entityPairs = [
+        {character: '&', html: '&amp;'},
+        {character: '<', html: '&lt;'},
+        {character: '>', html: '&gt;'},
+        {character: "'", html: '&apos;'},
+        {character: '"', html: '&quot;'},
+    ];
+
+    entityPairs.forEach(function(pair){
+        var reg = new RegExp(pair.character, 'g');
+        str = str.replace(reg, pair.html);
+    });
+    return str;
+}
+
+exports.remove_curly_brace_keep_text = remove_curly_brace_keep_text
+exports.convertHTML = convertHTML
diff --git a/extract_from_ass_subtitle/package.json b/extract_from_ass_subtitle/package.json
new file mode 100644
index 0000000..4760fed
--- /dev/null
+++ b/extract_from_ass_subtitle/package.json
@@ -0,0 +1,14 @@
+{
+  "name": "cc_nodejs",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "ass-parser": "^0.2.0"
+  }
+}