Describe the bug

element-plus 中使用服务方式调用Loading ，不会自动引入样式

        this.loading = ElLoading.service({
          lock: true,
          text: '正在卖力加载中....'
        });

Reproduction

    this.loading = ElLoading.service({           lock: true,           text: '正在卖力加载中....'         });

System Info

无样式

Used Package Manager

npm

Validations

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• Read the Contributing Guide.
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• The provided reproduction is a minimal reproducible of the bug.