feat: shouldUseTaobao done

Author: KuangPF

.vscode/settings.json

@@ -1,3 +1,7 @@
 {
-  "search.followSymlinks": false
+  "search.followSymlinks": false,
+  "files.exclude": {
+    "**/bower_components": true,
+    "**/node_modules": true
+  }
 }

packages/@vue/cli/lib/Creator.js

@@ -73,8 +73,8 @@ module.exports = class Creator extends EventEmitter {
         preset = await this.resolvePreset(cliOptions.preset, cliOptions.clone)
       } else if (cliOptions.default) {
         // vue create foo --default
-        preset = defaults.presets.default
-      } else if (cliOptions.inlinePreset) {
+        preset = defaults.presets.default // 使用默认预设选项
+      } else if (cliOptions.inlinePreset) { // 使用内联的 JSON 字符串预设选项
         // vue create foo --inlinePreset {...}
         try {
           preset = JSON.parse(cliOptions.inlinePreset)

packages/@vue/cli/lib/util/shouldUseTaobao.js

@@ -23,7 +23,7 @@ module.exports = async function shouldUseTaobao (command = 'npm') {
   checked = true
 
   // previously saved preference
-  const saved = loadOptions().useTaobaoRegistry
+  const saved = loadOptions().useTaobaoRegistry // ～/.vuerc 中 useTaobaoRegistry 字段
   if (typeof saved === 'boolean') {
     return (result = saved)
   }
@@ -34,7 +34,7 @@ module.exports = async function shouldUseTaobao (command = 'npm') {
     return val
   }
 
-  const userCurrent = (await execa(command, ['config', 'get', 'registry'])).stdout
+  const userCurrent = (await execa(command, ['config', 'get', 'registry'])).stdout // npm config get registry 获取用户是否设置了
   const defaultRegistry = registries[command]
 
   if (removeSlash(userCurrent) !== removeSlash(defaultRegistry)) {
@@ -44,6 +44,7 @@ module.exports = async function shouldUseTaobao (command = 'npm') {
 
   let faster
   try {
+    // Promise.race 哪个结果获取的快就返回哪个
     faster = await Promise.race([
       ping(defaultRegistry),
       ping(registries.taobao)