javascript - vue2+sass背景404

1.vue2+sass，是用官方的demo,在scss文件里引入图片会导致404，找不到图片的问题。

2..icon::before{
background-image:url('../images/commbg.png');
}

3.* ../images/commbg.png in ./~/css-loader?{"minimize":false,"sourceMap":false}!./~/vue-loader/lib/style-rewriter.js?{"id":"data-v-5ff33e41","scoped":false,"hasInlineConfig":false}!./~/sass-loader/lib/loader.js?{"sourceMap":false}!./~/vue-loader/lib/selector.js?type=styles&index=0!./src/pages/address/children/book.vue

4.

5.试过用
background-image:url('/images/commbg.png');

webpack设置alias
都不能解决