使用ant-design-vue的Form表单_vuedesign,form示例

使用脚手架新建项目

vue create antd-demo
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所以，得到了这么一个项目，如下，

安装并导入ant-design-vue，使用Form组件

npm install --save ant-design-vue@next
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修改main.ts

import { createApp } from 'vue';
import App from './App.vue';
import Antd from "ant-design-vue";
import "ant-design-vue/dist/antd.css";

createApp(App).use(Antd).mount('#app');
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修改App.vue

<template>
  <HelloWorld/>
</template>

<script lang="ts">
import { defineComponent } from 'vue';
import HelloWorld from './components/HelloWorld.vue';

export default defineComponent({
  name: 'App',
  components: {
    HelloWorld
  }
});
</script>

<style>
#app {
  font-family: Avenir, Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-align: center;
  color: #2c3e50;
  margin-top: 60px;
}
</style>

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修改HelloWorld.vue

<template>
  <a-form
    layout="inline"
    :model="formState"
    @finish="handleFinish"
    @finishFailed="handleFinishFailed"
  >
    <a-form-item>
      <a-input v-model:value="formState.user" placeholder="Username">
        <template #prefix><UserOutlined style="color: rgba(0, 0, 0, 0.25)" /></template>
      </a-input>
    </a-form-item>
    <a-form-item>
      <a-input v-model:value="formState.password" type="password" placeholder="Password">
        <template #prefix><LockOutlined style="color: rgba(0, 0, 0, 0.25)" /></template>
      </a-input>
    </a-form-item>
    <a-form-item>
      <a-button
        type="primary"
        html-type="submit"
        :disabled="formState.user === '' || formState.password === ''"
      >
        Log in
      </a-button>
    </a-form-item>
  </a-form>
</template>
<script lang="ts">
import { UserOutlined, LockOutlined } from '@ant-design/icons-vue';
import { ValidateErrorEntity } from 'ant-design-vue/es/form/interface';
import { defineComponent, reactive, UnwrapRef } from 'vue';
interface FormState {
  user: string;
  password: string;
}
export default defineComponent({
  setup() {
    const formState: UnwrapRef<FormState> = reactive({
      user: '',
      password: '',
    });
    const handleFinish = (values: FormState) => {
      console.log(values, formState);
    };
    const handleFinishFailed = (errors: ValidateErrorEntity<FormState>) => {
      console.log(errors);
    };
    return {
      formState,
      handleFinish,
      handleFinishFailed,
    };
  },
  components: {
    UserOutlined,
    LockOutlined,
  },
});
</script>
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启动应用，测试验证

npm run serve启动应用，效果如下，

好了，应用就暂时介绍到这里。其实，我更想说说我的疑惑：
Hello.vue中，Username输入框的前面有个图片前缀，Password输入框的前面也有一个图片前缀，都是通过<template #prefix></template>实现的，一眼看去，应该就是通过插槽实现的，但是具体的实现过程是怎样的，尚不清楚。
简单调试了一下，如下图所示。

ant-design-vue的Form组件的FormItem.js的部分源码如下，