first commit

miniprogram/@vant/weapp/dist/overlay/index.js

@@ -0,0 +1,26 @@
+import { VantComponent } from '../common/component';
+VantComponent({
+    props: {
+        show: Boolean,
+        customStyle: String,
+        duration: {
+            type: null,
+            value: 300,
+        },
+        zIndex: {
+            type: Number,
+            value: 1,
+        },
+        lockScroll: {
+            type: Boolean,
+            value: true,
+        },
+    },
+    methods: {
+        onClick() {
+            this.$emit('click');
+        },
+        // for prevent touchmove
+        noop() { },
+    },
+});

miniprogram/@vant/weapp/dist/overlay/index.json

@@ -0,0 +1,6 @@
+{
+  "component": true,
+  "usingComponents": {
+    "van-transition": "../transition/index"
+  }
+}

miniprogram/@vant/weapp/dist/overlay/index.wxml

@@ -0,0 +1,21 @@
+<van-transition
+  wx:if="{{ lockScroll }}"
+  show="{{ show }}"
+  custom-class="van-overlay"
+  custom-style="z-index: {{ zIndex }}; {{ customStyle }}"
+  duration="{{ duration }}"
+  bind:tap="onClick"
+  catch:touchmove="noop"
+>
+  <slot></slot>
+</van-transition>
+<van-transition
+  wx:else
+  show="{{ show }}"
+  custom-class="van-overlay"
+  custom-style="z-index: {{ zIndex }}; {{ customStyle }}"
+  duration="{{ duration }}"
+  bind:tap="onClick"
+>
+  <slot></slot>
+</van-transition>

miniprogram/@vant/weapp/dist/overlay/index.wxss

@@ -0,0 +1 @@
+@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%}