fix: nextTick support IE

youing · Dec 1, 2017 · 738eee6 · 738eee6
1 parent ef9569a
commit 738eee6
Showing 1 changed file with 7 additions and 6 deletions.
diff --git a/packages/nerv-utils/src/next-tick.ts b/packages/nerv-utils/src/next-tick.ts
@@ -1,11 +1,12 @@
-import { isFunction } from './is'
+const canUsePromise = 'Promise' in window
 
-const resolved = Promise.resolve()
+let resolved
+if (canUsePromise) {
+ resolved = Promise.resolve()
+}
 
-const nextTick: (fn) => void = isFunction(Promise)
+const nextTick: (fn) => void = canUsePromise
  ? (fn) => resolved.then(fn)
- : isFunction(requestAnimationFrame)
- ? requestAnimationFrame
- : setTimeout
+ : 'requestAnimationFrame' in window ? requestAnimationFrame : setTimeout
 
 export default nextTick