Vue3踩坑记录

'defineProps' is not defined

vue3+webpack5+ts

# 版本8以上
$ npm i eslint@latest -D
$ npm i eslint-plugin-vue@latest -D
# 后续若出现TypeError: eslint.CLIEngine is not a constructor错误执行以下命令
$ npm uninstall @vue/cli-plugin-eslint

TypeError: eslint.CLIEngine is not a constructor

vue3+webpack5+ts

$ npm uninstall @vue/cli-plugin-eslint

用$refs获取子组件

  1. 像在vue2中一样,给组件设置ref="xxx"

    <template>
    	<child-comp ref="child">
      	我是子组件
      </child-comp>
    </template>
    <script setup>
      import ChildComp from "./ChildComp.vue";
      import { ref } from "vue";
      const child = ref()
    </script>
    
  2. vue3中通过ref来获取,变量名需与ref='xxx'一致

    <template>
    	<child-comp ref="child">
      	我是子组件
      </child-comp>
    </template>
    <script setup>
      import ChildComp from "./ChildComp.vue";
      import { ref } from "vue";
      const child = ref()
    </script>
    
  3. 在onMounted函数中打印获取到的子组件,否则打印出undefined

    <template>
    	<child-comp ref="child">
      	我是子组件
      </child-comp>
    </template>
    <script setup>
      import ChildComp from "./ChildComp.vue";
      import { ref } from "vue";
      const child = ref()
      onMounted(() => {
        console.log(child.value)//打印结果: Proxy {...}
      })
    </script>
    
  4. 为了使用子组件中的变量或方法,需要在子组件中使用defineExpose编译器宏

    <!-- ChildComp.vue -->
    <template>子组件内部</template>
      
    <script setup>
    const greet = () => {
      console.log("hello parent!");
    }
    defineExpose({
      greet
    });
    </script>
      
    <style>
    </style>
    
  5. 父组件调用时用child.value.xxx来调用

    <template>
    	<child-comp ref="child">
      	我是子组件
      </child-comp>
    </template>
    <script setup>
      import ChildComp from "./ChildComp.vue";
      import { ref } from "vue";
      const child = ref()
      onMounted(() => {
        console.log(child.value)//打印结果: Proxy {...}
        child.value.greet()
      })
    </script>
    

vue-router配置*页面

vue3+vite2+ts+vue-router4

// vue2中
{
  path: '*'
}
// vue3中 用 /:pathMatch(.*)* 或 /:pathMatch(.*) 或 /:catchAll(.*)
{
  path: '/:pathMatch(.*)'
}
posted @ 2022-03-25 14:42  枫子_dan  阅读(541)  评论(0编辑  收藏  举报