diff --git a/packages/notify/notify.ts b/packages/notify/notify.ts
index dc13906a..47f854aa 100644
--- a/packages/notify/notify.ts
+++ b/packages/notify/notify.ts
@@ -39,7 +39,7 @@ function getContext() {
 }
 
 export default function Notify(options: NotifyOptions | string) {
-  options = Object.assign({}, defaultOptions, parseOptions(options));
+  options = { ...defaultOptions, ...parseOptions(options) } as NotifyOptions;
 
   const context = options.context || getContext();
   const notify = context.selectComponent(options.selector);
@@ -57,7 +57,7 @@ export default function Notify(options: NotifyOptions | string) {
 }
 
 Notify.clear = function(options?: NotifyOptions) {
-  options = Object.assign({}, defaultOptions, parseOptions(options));
+  options = { ...defaultOptions, ...parseOptions(options) } as NotifyOptions;
 
   const context = options.context || getContext();
   const notify = context.selectComponent(options.selector);
diff --git a/packages/slider/index.ts b/packages/slider/index.ts
index ff187696..56917b83 100644
--- a/packages/slider/index.ts
+++ b/packages/slider/index.ts
@@ -60,7 +60,7 @@ VantComponent({
       this.dragStatus = 'draging';
 
       this.getRect('.van-slider').then((rect: WechatMiniprogram.BoundingClientRectCallbackResult) => {
-        const diff = this.deltaX / rect.width * 100;
+        const diff = (this.deltaX / rect.width) * 100;
         this.newValue = this.startValue + diff;
         this.updateValue(this.newValue, false, true);
       });
@@ -81,7 +81,7 @@ VantComponent({
       const { min } = this.data;
 
       this.getRect('.van-slider').then((rect: WechatMiniprogram.BoundingClientRectCallbackResult) => {
-        const value = (event.detail.x - rect.left) / rect.width * this.getRange() + min;
+        const value = ((event.detail.x - rect.left) / rect.width) * this.getRange() + min;
         this.updateValue(value, true);
       });
     },