vue中img src 动态加载本地json的图片路径写法

<img class="thumb" width="200px" height="150px" :src="getThumb(item.type)" />

<script>
...
methods: {
  getThumb(type) {
   let thumb = {
    WMS: require("img/world.jpg"),
    WFS: require("img/wfs.jpg"),
    tool: require("img/tool.jpg")
   };
   return thumb[type];
  }
}
...
</script>

...
 resolve: {
  extensions: ['.js', '.vue', '.json'],
  alias: {
   'vue$': 'vue/dist/vue.esm.js',
   '@': resolve('src'),
   'assets': path.resolve(__dirname, '../src/assets'),
   'img': resolve('static/img'),
   '%': resolve('./static')
  }
 },
...

<img class="thumb" width="200px" height="150px" src="/static/img/world.jpg" />