feat: Popup component

src-next/overlay/test/__snapshots__/demo.spec.js.snap

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+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`renders demo correctly 1`] = `
+<div>
+  <div><button class="van-button van-button--primary van-button--normal" style="margin-left: 16px;">
+      <div class="van-button__content"><span class="van-button__text">显示遮罩层</span></div>
+    </button>
+    <div class="van-overlay" style="display: none;" name="van-fade"></div>
+  </div>
+  <div><button class="van-button van-button--primary van-button--normal" style="margin-left: 16px;">
+      <div class="van-button__content"><span class="van-button__text">嵌入内容</span></div>
+    </button>
+    <div class="van-overlay" style="display: none;" name="van-fade">
+      <div class="wrapper">
+        <div class="block"></div>
+      </div>
+    </div>
+  </div>
+</div>
+`;

src-next/overlay/test/__snapshots__/index.spec.js.snap

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+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`class-name prop 1`] = `<div class="van-overlay my-overlay" name="van-fade"></div>`;
+
+exports[`custom style prop 1`] = `<div class="van-overlay" style="background-color: red;" name="van-fade"></div>`;
+
+exports[`default slot 1`] = `<div class="van-overlay" style="display: none;" name="van-fade">Custom Default</div>`;
+
+exports[`duration prop 1`] = `<div class="van-overlay" style="animation-duration: 1s;" name="van-fade"></div>`;
+
+exports[`z-index prop 1`] = `<div class="van-overlay" style="z-index: 99;" name="van-fade"></div>`;