fix(reactivity): should trigger all effects when array length is mutated (#754)

2020-02-21 18:38:07 +08:00
parent c54aa43fa7
commit 5fac65589b
2 changed files with 27 additions and 2 deletions
--- a/packages/reactivity/src/effect.ts
+++ b/packages/reactivity/src/effect.ts
@@ -174,8 +174,9 @@ export function trigger(
  }
  const effects = new Set<ReactiveEffect>()
  const computedRunners = new Set<ReactiveEffect>()
-  if (type === TriggerOpTypes.CLEAR) {
-    // collection being cleared, trigger all effects for target
+  if (type === TriggerOpTypes.CLEAR || (key === 'length' && isArray(target))) {
+    // collection being cleared or Array length mutation
+    // trigger all effects for target
    depsMap.forEach(dep => {
      addRunners(effects, computedRunners, dep)
    })