diff --git a/.github/workflows/node.js.yml b/.github/workflows/node.js.yml
index 789fe49..1957fad 100644
--- a/.github/workflows/node.js.yml
+++ b/.github/workflows/node.js.yml
@@ -14,7 +14,7 @@ jobs:
 
     runs-on: ubuntu-latest
 
-    strategy:
+    strategy: # strategy 定义 job 的运行参数
       matrix:
         node-version: [16.x]
         # See supported Node.js release schedule at https://nodejs.org/en/about/releases/
@@ -27,4 +27,4 @@ jobs:
         node-version: ${{ matrix.node-version }}
     - run: npm i
     # Just run tests once
-    - run: npm test
\ No newline at end of file
+    - run: npm test
diff --git a/Readme.md b/Readme.md
index 48612c6..5140de5 100644
--- a/Readme.md
+++ b/Readme.md
@@ -8,4 +8,13 @@
 
 ### 注意
 
-大家可以选择 tapable@0.2，也可以选择 tapable@1.x，这个看大家个人喜好哈，虽然我用的是0.2
\ No newline at end of file
+大家可以选择 tapable@0.2，也可以选择 tapable@1.x，这个看大家个人喜好哈，虽然我用的是0.2
+
+### 项目克隆至本地之后， npm install 、 npm run test 之后报如下错误
+> Cannot start ChromeHeadless
+> Can not find the binary C:\Users\唐明响\Desktop\前端进阶培训_极客时间\homework\homework2\node_modules\puppeteer\.local-chromium\win64-1022525\chrome-win\chrome.exe
+> Please set env variable CHROME_BIN
+> 此时只需要将 karma.conf.js 配置文件中的
+>   process.env.CHROME_BIN = require('puppeteer').executablePath()  改为
+>   process.env.CHROME_BIN = 'C:\\Program Files\\Google\\Chrome\\Application\\chrome.exe'  （即本地 Chrome 浏览器启动的路径即可）
+> 参考 https://www.npmjs.com/package/karma-chrome-launcher
diff --git a/karma.conf.js b/karma.conf.js
index 9f54051..b28c843 100644
--- a/karma.conf.js
+++ b/karma.conf.js
@@ -1,6 +1,8 @@
 // Karma configuration
 // Generated on Fri Aug 11 2017 22:02:05 GMT+0800 (CST)
-process.env.CHROME_BIN = require('puppeteer').executablePath()
+// process.env.CHROME_BIN = require('puppeteer').executablePath()
+process.env.CHROME_BIN = 'C:\\Program Files\\Google\\Chrome\\Application\\chrome.exe'
+console.log(process.env.CHROME_BIN);
 module.exports = function(config) {
   config.set({
 
diff --git a/lib/db.js b/lib/db.js
index a1fe32c..404db26 100644
--- a/lib/db.js
+++ b/lib/db.js
@@ -1,12 +1,48 @@
 const Tapable = require('tapable')
 
 class DB extends Tapable {
-  constructor() {
-    // TODO
+  constructor(options) {
+    // TODO 
+    super()
+    this.options = options
   }
 
-  request() {
-    // TODO
+  // request(options) {
+  //   // TODO
+  //   // return this.applyPluginsWaterfall('endpoint') // 1
+  //   // return this.applyPluginsWaterfall0('endpoint') // 1
+  //   // return this.applyPluginsBailResult('endpoint') // 1
+  //   // if (this.options) {
+  //   //   this.options = this.applyPluginsWaterfall0('options',this.options) //
+  //   // }
+  //   return this.applyPluginsBailResult('endpoint',options) // 1 2
+  // }
+
+  // request(options) {
+  //   if (!this.options) {
+  //     this.options = {}
+  //   }
+  //   Object.assign(this.options, options);
+  //   this.options = this.applyPluginsWaterfall0('options',this.options) //
+  //   return this.applyPluginsBailResult('endpoint', this.options) // 1 2 3
+  // }
+  
+  request(params = {}) {
+    if (!this.options) {
+      this.options = {}
+    }
+    let newParams = Object.assign(params, this.options)
+    this.applyPluginsWaterfall0('options',newParams)
+    newParams = Object.assign(newParams, this.options)
+    return new Promise((resolve,reject) => {
+      this.applyPluginsBailResult('endpoint', newParams).then(res => {
+        // 超时
+        // return this.applyPluginsWaterfall('judge',res) ? reject(res) : resolve(res)
+        return this.applyPluginsBailResult('judge',res) ? reject(res) : resolve(res)
+      }, res => {
+        return reject()
+      })
+    })
   }
 }