1. 修改config/index.js

module.exports = {
  dev: {
	...
    assetsPublicPath: './',
    ...
  },

  build: {
    ...
    assetsPublicPath: './',
	...
  }
}

2. 修改src/router/index.js

export default new Router({
  //如打包文件存放在Tomcat/webapps/vue_test下，那么久这么写
  base: '/vue_test/',
  mode: 'history',
  routes: [
  	...
  ]
})

3. 然后输入url：http://localhost:8080/vue_test/