ElementUI重复引入样式问题

背景：vue-cli 创建的项目， Element UI 作为 UI 组件库，采用组件按需引入的方式并使用了在项目中改变 SCSS 变量 的方式定义主题。但是项目打包后，却出现两份样式文件，一份在 app.css 、一份在 chunk-vendors.css 中。app.css 中是全量引入的且样式不同于组件的默认样式，chunk-vendors.css 中是按需引入的且样式是组件的默认样式。

现状

1. 借助 babel-plugin-component 按需引入组件
2. 改变 Element 的样式变量，js 方式引入 import './element-variables.scss'

解决方案：

1. 配置 babel-plugin-component（只能全量引入）
2. 分为两个文件 var.sass 和 theme.sass（可全量引入）

重度依赖推荐使用 NO.1 ，轻度依赖推荐使用 NO.2

NO.1

修改 babel 文件的配置

目的为不打包 Element UI 组件库

{
  presets: [['es2015', { modules: false }]],
  plugins: [
    [
      'component',
      {
        libraryName: 'element-ui',
        // styleLibraryName: 'theme-chalk', // 删除此行
        style: false, // 添加此行
      }
    ]
  ]
}

在项目中改变 SCSS 变量

Element 的 theme-chalk 使用 SCSS 编写，如果你的项目也使用了 SCSS，那么可以直接在项目中改变 Element 的样式变量。新建一个样式文件，例如 element-variables.scss，写入以下内容：

/* 改变主题色变量 */
$--color-primary: teal;

/* 改变 icon 字体路径变量，必需 */
$--font-path: '~element-ui/lib/theme-chalk/fonts';

@import "~element-ui/packages/theme-chalk/src/index";

之后，在项目的入口文件中，直接引入以上样式文件即可（无需引入 Element 编译好的 CSS 文件）：

import Vue from 'vue'
import Element from 'element-ui'
import './element-variables.scss'

Vue.use(Element)

NO.2

新建 sass 文件

/* src/asseets/element-var.scss */
$--color-primary: teal;

/* 改变 icon 字体路径变量，必需 */
$--font-path: '~element-ui/lib/theme-chalk/fonts';

@import "~element-ui/packages/theme-chalk/src/index";

/* src/asseets/element-theme.scss */
@import "~element-ui/packages/theme-chalk/src/input.scss";
@import "~element-ui/packages/theme-chalk/src/radio.scss";
// @import "~element-ui/packages/theme-chalk/src/checkbox.scss";
...

在 App.vue 中引入

完整组件样式引入方式

Element UI 2.12.0 所有样式的引用

@import "~element-ui/packages/theme-chalk/src/pagination.scss";
@import "~element-ui/packages/theme-chalk/src/dialog.scss";
@import "~element-ui/packages/theme-chalk/src/autocomplete.scss";
@import "~element-ui/packages/theme-chalk/src/dropdown.scss";
@import "~element-ui/packages/theme-chalk/src/dropdown-menu.scss";
@import "~element-ui/packages/theme-chalk/src/dropdown-item.scss";
@import "~element-ui/packages/theme-chalk/src/menu.scss";
@import "~element-ui/packages/theme-chalk/src/submenu.scss";
@import "~element-ui/packages/theme-chalk/src/menu-item.scss";
@import "~element-ui/packages/theme-chalk/src/menu-item-group.scss";
@import "~element-ui/packages/theme-chalk/src/input.scss";
@import "~element-ui/packages/theme-chalk/src/input-number.scss";
@import "~element-ui/packages/theme-chalk/src/radio.scss";
@import "~element-ui/packages/theme-chalk/src/radio-group.scss";
@import "~element-ui/packages/theme-chalk/src/radio-button.scss";
@import "~element-ui/packages/theme-chalk/src/checkbox.scss";
@import "~element-ui/packages/theme-chalk/src/checkbox-button.scss";
@import "~element-ui/packages/theme-chalk/src/checkbox-group.scss";
@import "~element-ui/packages/theme-chalk/src/switch.scss";
@import "~element-ui/packages/theme-chalk/src/select.scss";
@import "~element-ui/packages/theme-chalk/src/button.scss";
@import "~element-ui/packages/theme-chalk/src/button-group.scss";
@import "~element-ui/packages/theme-chalk/src/table.scss";
@import "~element-ui/packages/theme-chalk/src/table-column.scss";
@import "~element-ui/packages/theme-chalk/src/date-picker.scss";
@import "~element-ui/packages/theme-chalk/src/time-select.scss";
@import "~element-ui/packages/theme-chalk/src/time-picker.scss";
@import "~element-ui/packages/theme-chalk/src/popover.scss";
@import "~element-ui/packages/theme-chalk/src/tooltip.scss";
@import "~element-ui/packages/theme-chalk/src/message-box.scss";
@import "~element-ui/packages/theme-chalk/src/breadcrumb.scss";
@import "~element-ui/packages/theme-chalk/src/breadcrumb-item.scss";
@import "~element-ui/packages/theme-chalk/src/form.scss";
@import "~element-ui/packages/theme-chalk/src/form-item.scss";
@import "~element-ui/packages/theme-chalk/src/tabs.scss";
@import "~element-ui/packages/theme-chalk/src/tab-pane.scss";
@import "~element-ui/packages/theme-chalk/src/tag.scss";
@import "~element-ui/packages/theme-chalk/src/tree.scss";
@import "~element-ui/packages/theme-chalk/src/alert.scss";
@import "~element-ui/packages/theme-chalk/src/notification.scss";
@import "~element-ui/packages/theme-chalk/src/slider.scss";
@import "~element-ui/packages/theme-chalk/src/loading.scss";
@import "~element-ui/packages/theme-chalk/src/row.scss";
@import "~element-ui/packages/theme-chalk/src/col.scss";
@import "~element-ui/packages/theme-chalk/src/upload.scss";
@import "~element-ui/packages/theme-chalk/src/progress.scss";
@import "~element-ui/packages/theme-chalk/src/spinner.scss";
@import "~element-ui/packages/theme-chalk/src/message.scss";
@import "~element-ui/packages/theme-chalk/src/badge.scss";
@import "~element-ui/packages/theme-chalk/src/card.scss";
@import "~element-ui/packages/theme-chalk/src/rate.scss";
@import "~element-ui/packages/theme-chalk/src/steps.scss";
@import "~element-ui/packages/theme-chalk/src/step.scss";
@import "~element-ui/packages/theme-chalk/src/carousel.scss";
@import "~element-ui/packages/theme-chalk/src/scrollbar.scss";
@import "~element-ui/packages/theme-chalk/src/carousel-item.scss";
@import "~element-ui/packages/theme-chalk/src/collapse.scss";
@import "~element-ui/packages/theme-chalk/src/collapse-item.scss";
@import "~element-ui/packages/theme-chalk/src/cascader.scss";
@import "~element-ui/packages/theme-chalk/src/color-picker.scss";
@import "~element-ui/packages/theme-chalk/src/transfer.scss";
@import "~element-ui/packages/theme-chalk/src/container.scss";
@import "~element-ui/packages/theme-chalk/src/header.scss";
@import "~element-ui/packages/theme-chalk/src/aside.scss";
@import "~element-ui/packages/theme-chalk/src/main.scss";
@import "~element-ui/packages/theme-chalk/src/footer.scss";
@import "~element-ui/packages/theme-chalk/src/timeline.scss";
@import "~element-ui/packages/theme-chalk/src/timeline-item.scss";
@import "~element-ui/packages/theme-chalk/src/link.scss";
@import "~element-ui/packages/theme-chalk/src/divider.scss";
@import "~element-ui/packages/theme-chalk/src/image.scss";
@import "~element-ui/packages/theme-chalk/src/calendar.scss";
@import "~element-ui/packages/theme-chalk/src/backtop.scss";
@import "~element-ui/packages/theme-chalk/src/infinite-scroll.scss";
@import "~element-ui/packages/theme-chalk/src/page-header.scss";
@import "~element-ui/packages/theme-chalk/src/cascader-panel.scss";
@import "~element-ui/packages/theme-chalk/src/avatar.scss";
@import "~element-ui/packages/theme-chalk/src/drawer.scss";
@import "~element-ui/packages/theme-chalk/src/popconfirm.scss";

参考文章

1、https://github.com/ElemeFE/el...

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