Clear up warnings when running test cases.

build/bin/build-components.js

@@ -1,3 +1,6 @@
+/**
+ * 编译 components 到 lib 目录
+ */
 const fs = require('fs-extra');
 const path = require('path');
 const compiler = require('vue-sfc-compiler');
@@ -5,9 +8,16 @@ const libDir = path.resolve(__dirname, '../../lib');
 const srcDir = path.resolve(__dirname, '../../packages');
 require('shelljs/global');
 
+// 清空 lib 目录
 fs.emptyDirSync(libDir);
+
+// 复制 packages
 fs.copySync(srcDir, libDir);
+
+// 编译所有 .vue 文件到 .js
 compileVueFiles(libDir);
+
+// babel 编译
 exec('cross-env BABEL_ENV=commonjs babel lib --out-dir lib');
 
 function compileVueFiles(dir) {
@@ -16,11 +26,16 @@ function compileVueFiles(dir) {
   files.forEach(file => {
     const absolutePath = path.resolve(dir, file);
 
+    // 移除 vant-css
     if (file.indexOf('vant-css') !== -1) {
       fs.removeSync(absolutePath);
-    } else if (isDir(absolutePath)) {
+    }
+    // 遍历文件夹
+    else if (isDir(absolutePath)) {
       return compileVueFiles(absolutePath);
-    } else if (/\.vue$/.test(file)) {
+    }
+    // 编译 .vue 文件
+    else if (/\.vue$/.test(file)) {
       const source = fs.readFileSync(absolutePath, 'utf-8');
       fs.removeSync(absolutePath);