diff --git a/packages/uni-mp-weixin/dist/mp.js b/packages/uni-mp-weixin/dist/mp.js
index 426517fd8447b303669af156c815d0b7d6821740..1f12686b1e63243947971856f8bc0b3821713fda 100644
--- a/packages/uni-mp-weixin/dist/mp.js
+++ b/packages/uni-mp-weixin/dist/mp.js
@@ -508,9 +508,9 @@ function initProperties (vm, instanceData) {
         /* eslint-disable no-self-compare */
         if (newVal === value || (newVal !== newVal && value !== value)) {
           return
-        }
+        }
+        value = newVal;
         if (observer) {
-          value = newVal;
           observe(observer, vm, newVal, oldVal);
         }
         // 触发渲染
diff --git a/src/core/runtime/mp/polyfill/state/properties.js b/src/core/runtime/mp/polyfill/state/properties.js
index 0d55c3aae22f3f8ae7e9b1c6913d1d6fab9a96f5..174eca6211adc6d1cc3f7de6fcdc8bec43cd022b 100644
--- a/src/core/runtime/mp/polyfill/state/properties.js
+++ b/src/core/runtime/mp/polyfill/state/properties.js
@@ -84,9 +84,9 @@ export function initProperties (vm, instanceData) {
         /* eslint-disable no-self-compare */
         if (newVal === value || (newVal !== newVal && value !== value)) {
           return
-        }
+        }
+        value = newVal
         if (observer) {
-          value = newVal
           observe(observer, vm, newVal, oldVal)
         }
         // 触发渲染