fix(Slider): fix decimal value

packages/common/utils.ts

@@ -96,6 +96,15 @@ export function toPromise(promiseLike: Promise<unknown> | unknown) {
   return Promise.resolve(promiseLike);
 }
 
+// 浮点数精度处理
+export function addNumber(num1, num2) {
+  const cardinal = 10 ** 10;
+  return Math.round((num1 + num2) * cardinal) / cardinal;
+}
+
+// 限制value在[min, max]之间
+export const clamp = (num, min, max) => Math.min(Math.max(num, min), max);
+
 export function getCurrentPage<T>() {
   const pages = getCurrentPages();
   return pages[pages.length - 1] as T & WechatMiniprogram.Page.TrivialInstance;

packages/slider/index.ts

@@ -1,7 +1,7 @@
 import { VantComponent } from '../common/component';
 import { touch } from '../mixins/touch';
 import { canIUseModel } from '../common/version';
-import { getRect, addUnit, nextTick } from '../common/utils';
+import { getRect, addUnit, nextTick, addNumber, clamp } from '../common/utils';
 
 type SliderValue = number | [number, number];
 
@@ -238,8 +238,13 @@ VantComponent({
     },
 
     format(value: number) {
-      const { max, min, step } = this.data;
-      return Math.round(Math.max(min, Math.min(value, max)) / step) * step;
+      const min = +this.data.min;
+      const max = +this.data.max;
+      const step = +this.data.step;
+
+      value = clamp(value, min, max);
+      const diff = Math.round((value - min) / step) * step;
+      return addNumber(min, diff);
     },
   },
 });