ant-design-vue/antdv-demo/docs/modal/demo/position.md

#### 自定义位置 使用 `centered` 或类似 `dialogStyle.top` 的样式来设置对话框位置。 #### To customize the position of modal You can use `centered`,`dialogStyle.top` or other styles to set position of modal dialog.

<template>
  <div id="components-modal-demo-position">
    <a-button type="primary" @click="() => setModal1Visible(true)">
      Display a modal dialog at 20px to Top
    </a-button>
    <a-modal
      title="20px to Top"
      :dialog-style="{ top: '20px' }"
      :visible="modal1Visible"
      @ok="() => setModal1Visible(false)"
      @cancel="() => setModal1Visible(false)"
    >
      <p>some contents...</p>
      <p>some contents...</p>
      <p>some contents...</p>
    </a-modal>
    <br /><br />
    <a-button type="primary" @click="() => (modal2Visible = true)">
      Vertically centered modal dialog
    </a-button>
    <a-modal
      v-model="modal2Visible"
      title="Vertically centered modal dialog"
      centered
      @ok="() => (modal2Visible = false)"
    >
      <p>some contents...</p>
      <p>some contents...</p>
      <p>some contents...</p>
    </a-modal>
  </div>
</template>
<script>
export default {
  data() {
    return {
      modal1Visible: false,
      modal2Visible: false,
    };
  },
  methods: {
    setModal1Visible(modal1Visible) {
      this.modal1Visible = modal1Visible;
    },
  },
};
</script>