提交初始版本，使用vant ui库

miniprogram_npm/@vant/weapp/overlay/index.d.ts

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+export {};

miniprogram_npm/@vant/weapp/overlay/index.js

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+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+var component_1 = require("../common/component");
+(0, component_1.VantComponent)({
+    props: {
+        show: Boolean,
+        customStyle: String,
+        duration: {
+            type: null,
+            value: 300,
+        },
+        zIndex: {
+            type: Number,
+            value: 1,
+        },
+        lockScroll: {
+            type: Boolean,
+            value: true,
+        },
+        rootPortal: {
+            type: Boolean,
+            value: false,
+        },
+    },
+    methods: {
+        onClick: function () {
+            this.$emit('click');
+        },
+        // for prevent touchmove
+        noop: function () { },
+    },
+});

miniprogram_npm/@vant/weapp/overlay/index.json

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+{
+  "component": true,
+  "usingComponents": {
+    "van-transition": "../transition/index"
+  }
+}

miniprogram_npm/@vant/weapp/overlay/index.wxml

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+<import src="./overlay.wxml" />
+
+<root-portal wx:if="{{ rootPortal }}">
+  <include src="./overlay.wxml" />
+</root-portal>
+
+<include wx:else src="./overlay.wxml" />

miniprogram_npm/@vant/weapp/overlay/index.wxss

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+@import '../common/index.wxss';.van-overlay{background-color:var(--overlay-background-color,rgba(0,0,0,.7));height:100%;left:0;position:fixed;top:0;width:100%}

miniprogram_npm/@vant/weapp/overlay/overlay.wxml

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+<van-transition
+  show="{{ show }}"
+  custom-class="van-overlay custom-class"
+  custom-style="z-index: {{ zIndex }}; {{ customStyle }}"
+  duration="{{ duration }}"
+  bind:tap="onClick"
+  catch:touchmove="{{ lockScroll ? 'noop' : ''}}"
+>
+  <slot></slot>
+</van-transition>