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+# Modal
+
+Modal dialog.
+
+#### When to use
+
+1.When requiring users to interact with the application, but without jumping to a new page and interrupting the user's workflow, you can use Modal to create a new floating layer over the current page to get user feedback or display information. 
+
+2.Modal plays an interactive role with users. Users can enter information, read prompts, set options and other operations in Modal.
+
+
+### Basic Usage
+
+:::demo `v-model` bidirectional binding, which controls whether Modal is displayed. `title` as parameter is to set modal title.
+
+```vue
+<template>
+  <d-button @click="handleClick">open modal</d-button>
+  <d-modal v-model="visible" title="Start Snapshot Version">
+    <div>name: {{ data.name }}</div>
+    <div>age: {{ data.age }}</div>
+    <div>address: {{ data.address }}</div>
+  </d-modal>
+</template>
+
+<script>
+import { defineComponent, ref, reactive } from 'vue';
+
+export default defineComponent({
+  setup() {
+    const visible = ref(false);
+    const data = reactive({
+      name: 'Tom',
+      age: 20,
+      address: 'Chengdu',
+    });
+    const handleClick = () => {
+      visible.value = true;
+    };
+
+    return { visible, data, handleClick };
+  },
+});
+</script>
+```
+
+:::
+
+### Keep Last Closed Position
+
+:::demo `keep-last` can keep the last closed position when the current modal is opened again.
+
+```vue
+<template>
+  <d-button @click="handleClick">open modal</d-button>
+  <d-modal v-model="visible" title="Start Keep Last" :keep-last="true">
+    <div>name: {{ data.name }}</div>
+    <div>age: {{ data.age }}</div>
+    <div>address: {{ data.address }}</div>
+  </d-modal>
+</template>
+
+<script>
+import { defineComponent, ref, reactive } from 'vue';
+
+export default defineComponent({
+  setup() {
+    const visible = ref(false);
+    const data = reactive({
+      name: 'Tom',
+      age: 20,
+      address: 'Chengdu',
+    });
+    const handleClick = () => {
+      visible.value = true;
+    };
+
+    return { visible, data, handleClick };
+  },
+});
+</script>
+```
+
+:::
+
+### Customize Title & Action Buttons
+
+:::demo `header` slot can customize Modal top area, subcomponent `d-modal-header` provides a default style for the top area, customized styles can be implemented by setting `style/class` in subcomponent. `footer` slot is the same.
+
+```vue
+<template>
+  <d-button @click="handleClick">open modal</d-button>
+  <d-modal v-model="visible">
+    <template #header>
+      <d-modal-header>
+        <d-icon name="like"></d-icon>
+        <span>Good Title</span>
+      </d-modal-header>
+    </template>
+    <div>name: {{ data.name }}</div>
+    <div>age: {{ data.age }}</div>
+    <div>address: {{ data.address }}</div>
+    <template #footer>
+      <d-modal-footer style="text-align: right; padding-right: 20px;">
+        <d-button @click="hidden">cancle</d-button>
+        <d-button @click="hidden">confirm</d-button>
+      </d-modal-footer>
+    </template>
+  </d-modal>
+</template>
+<script>
+import { ref, defineComponent, reactive } from 'vue';
+export default defineComponent({
+  setup() {
+    const visible = ref(false);
+    const data = reactive({
+      name: 'Tom',
+      age: 20,
+      address: 'Chengdu',
+    });
+    const handleClick = () => {
+      visible.value = true;
+    };
+    const hidden = () => {
+      visible.value = false;
+    };
+
+    return { visible, data, handleClick, hidden };
+  },
+});
+</script>
+```
+
+:::
+
+### Information Prompt
+
+:::demo Various types of information prompt modals.
+
+```vue
+<template>
+  <d-button class="mr-1" @click="handleClick('success')">success</d-button>
+  <d-button class="mr-1" @click="handleClick('failed')">failed</d-button>
+  <d-button class="mr-1" @click="handleClick('warning')">warning</d-button>
+  <d-button class="mr-1" @click="handleClick('info')">info</d-button>
+  <d-modal v-model="visible" title="Start Snapshot Version" :type="type">
+    <div>name: {{ data.name }}</div>
+    <div>age: {{ data.age }}</div>
+    <div>address: {{ data.address }}</div>
+  </d-modal>
+</template>
+
+<script>
+import { defineComponent, ref, reactive } from 'vue';
+
+export default defineComponent({
+  setup() {
+    const visible = ref(false);
+    const type = ref('');
+    const data = reactive({
+      name: 'Tom',
+      age: 20,
+      address: 'Chengdu',
+    });
+    const handleClick = (t: string) => {
+      visible.value = true;
+      type.value = t;
+    };
+
+    return { visible, data, handleClick, type };
+  },
+});
+</script>
+```
+
+:::
+
+### Callback Before Closing
+
+:::demo `before-close` called when the user clicks the close button or mask layer, you can close them through the `done` parameter after completing some asynchronous operations.
+
+```vue
+<template>
+  <d-button @click="handleClick">open modal</d-button>
+  <d-modal v-model="visible" :before-close="beforeClose" style="width: 500px;">
+    <div>name: {{ data.name }}</div>
+    <div>age: {{ data.age }}</div>
+    <div>address: {{ data.address }}</div>
+    <template #footer>
+      <d-modal-footer style="text-align: right; padding-right: 20px;">
+        <d-button @click="hidden">cancel</d-button>
+        <d-button @click="hidden">confirm</d-button>
+      </d-modal-footer>
+    </template>
+  </d-modal>
+</template>
+
+<script>
+import { ref, defineComponent, reactive } from 'vue';
+
+export default defineComponent({
+  setup() {
+    const visible = ref(false);
+    const data = reactive({
+      name: 'Tom',
+      age: 20,
+      address: 'Chengdu',
+    });
+    const handleClick = () => {
+      visible.value = true;
+    };
+    const hidden = () => {
+      visible.value = false;
+    };
+    const beforeClose = (done) => {
+      new Promise((resolve) => {
+        setTimeout(resolve, 1000);
+      }).then(done);
+    };
+
+    return { visible, data, handleClick, hidden, beforeClose };
+  },
+});
+</script>
+```
+
+:::
+
+### API
+
+|      Parameter        |       Type      |      Default     |     Description   |   Jump to Demo |
+| :-------------------: | :--------------: | :---------------------: | :--------------------------------------------: | :-------------------: |
+| v-model                | `boolean`                            | false  | Whether Modal is displayed                             | [Basic Usage](#basic-usage)     |
+| title                  | `string`                             | -      | Optional, Title of Modal                         | [Basic Usage](#basic-usage)     |
+| keep-last              | `boolean`                            | false  | Optional, whether to keep the last moved position  | [Keep Last Closed Position](#keep-last-closed-position)  
+| lock-scroll            | `boolean`                            | true   | Optional, whether to lock the body scrolling                 |
+| close-on-click-overlay | `boolean`                            | true   | Optional, whether Modal can be closed when clicking the blank           |
+| before-close           | `(done) => void`                     | -      | Optional, callback before closing, call `done` to close Modal | [Callback Before Closing](#callback-before-closing) |
+| escapable              | `boolean`                            | true   | Optional, whether the `esc` key is supported to close the modal              |                           |
+| show-close             | `boolean`                            | true   | Optional, whether to display the close button                     |                           |
+| draggable              | `boolean`                            | true   | Optional, whether modal can be dragged                       |
+| show-animation         | `boolean`                            | true   | Optional, whether to display animation                         |
+| show-overlay           | `boolean`                            | true   | Optional, whether to display mask layer                       |                           |
+| append-to-body         | `boolean`                            | true   | Optional, whether to promote Modal to the body layer          |                           |
+| type                   | success \| failed \| warning \| info | -      | Optional, modal information prompt                         |
+
+### Modal Slot
+
+| Slot name  | Description    |
+| :------ | :---------------- |
+| default | Modal content        |
+| header  | Custom Modal header |
+| footer  | Custom Modal footer |