chore: add vant-waterfall package

2019-08-21 15:08:22 +08:00
parent 495588e020
commit 3248f16719
7 changed files with 2501 additions and 0 deletions
@@ -0,0 +1,27 @@
+// eslint-disable-next-line import/no-mutable-exports
+export let supportsPassive = false;
+
+try {
+  const opts = {};
+  Object.defineProperty(opts, 'passive', {
+    // eslint-disable-next-line getter-return
+    get() {
+      /* istanbul ignore next */
+      supportsPassive = true;
+    }
+  });
+  window.addEventListener('test-passive', null, opts);
+// eslint-disable-next-line no-empty
+} catch (e) {}
+
+export function on(target, event, handler, passive = false) {
+  target.addEventListener(
+    event,
+    handler,
+    supportsPassive ? { capture: false, passive } : false
+  );
+}
+
+export function off(target, event, handler) {
+  target.removeEventListener(event, handler);
+}