touch operation...

src/libs/touch.js

@@ -0,0 +1,31 @@
+export function touchTapListener(fn, setting) {
+  const [touchLength, touchCount, touchTime] = setting;
+
+  let lastTouch = 0;
+  let curCount = 0;
+  const handleTouchend = (e) => {
+    if (e.touches.length !== touchLength) {
+      return;
+    }
+
+    const timer = setTimeout(() => {
+      clearTimeout(timer);
+      curCount = 0;
+    }, touchTime);
+
+    curCount++;
+    const now = Date.now();
+    if (curCount === touchCount && now - lastTouch <= touchTime) {
+      timer && clearTimeout(timer);
+      curCount = 0;
+      fn();
+    }
+
+    lastTouch = now;
+  };
+
+  document.addEventListener("touchend", handleTouchend);
+  return () => {
+    document.removeEventListener("touchend", handleTouchend);
+  };
+}