perf(pjax): 优化pjax跳转时顶部导航收缩问题

src/js/common.js

@@ -139,12 +139,12 @@ const commonContext = {
   },
   /* 处理滚动 */
   initScroll() {
-    let initTop = 0
+    window.initTop = 0
 
     // true：上划，false：下滑
     function scrollDirection(currentTop) {
-      const result = currentTop > initTop
-      initTop = currentTop
+      const result = currentTop > window.initTop
+      window.initTop = currentTop
       return result
     }
 

src/js/pjax.js

@@ -15,6 +15,8 @@ const initPjax = () => {
 const computeScrollTop = (target) => {
   // 当前为横幅大图模式，处理滚动
   if (target.pathname !== '/' && $('.banner').length !== 0) {
+    // 避免跳转时顶部导航栏收缩
+    window.initTop = 99999999
     return window.innerHeight / 4
   }
   return 0