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wechat/miniprogram/node_modules/@vant/weapp/dist/collapse-item/animate.js

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+import { canIUseAnimate } from '../common/version';
+import { getRect } from '../common/utils';
+function useAnimate(context, expanded, mounted, height) {
+  const selector = '.van-collapse-item__wrapper';
+  if (expanded) {
+    context.animate(
+      selector,
+      [
+        { height: 0, ease: 'ease-in-out', offset: 0 },
+        { height: `${height}px`, ease: 'ease-in-out', offset: 1 },
+        { height: `auto`, ease: 'ease-in-out', offset: 1 },
+      ],
+      mounted ? 300 : 0,
+      () => {
+        context.clearAnimation(selector);
+      }
+    );
+    return;
+  }
+  context.animate(
+    selector,
+    [
+      { height: `${height}px`, ease: 'ease-in-out', offset: 0 },
+      { height: 0, ease: 'ease-in-out', offset: 1 },
+    ],
+    300,
+    () => {
+      context.clearAnimation(selector);
+    }
+  );
+}
+function useAnimation(context, expanded, mounted, height) {
+  const animation = wx.createAnimation({
+    duration: 0,
+    timingFunction: 'ease-in-out',
+  });
+  if (expanded) {
+    if (height === 0) {
+      animation.height('auto').top(1).step();
+    } else {
+      animation
+        .height(height)
+        .top(1)
+        .step({
+          duration: mounted ? 300 : 1,
+        })
+        .height('auto')
+        .step();
+    }
+    context.setData({
+      animation: animation.export(),
+    });
+    return;
+  }
+  animation.height(height).top(0).step({ duration: 1 }).height(0).step({
+    duration: 300,
+  });
+  context.setData({
+    animation: animation.export(),
+  });
+}
+export function setContentAnimate(context, expanded, mounted) {
+  getRect(context, '.van-collapse-item__content')
+    .then((rect) => rect.height)
+    .then((height) => {
+      canIUseAnimate()
+        ? useAnimate(context, expanded, mounted, height)
+        : useAnimation(context, expanded, mounted, height);
+    });
+}