Failed to mount component: template or render function not defined. 错误的解决方法

Vue.js 2 遇到 vue.runtime.common.js?d43f:511 [Vue warn]: Failed to mount component: template or render function not defined. (found in root instance) 错误的解决方法。Vue.js 2 遇到 vue.runtime.common.js?d43f:511 [Vue wa