修改苹果浏览器兼容bug

frontend/saas-portal-web/src/components/conenter/home.vue

@@ -643,10 +643,10 @@
             step = step > 0 ? Math.ceil(step) : Math.floor(step);
             leader = leader + step;
             document.documentElement.scrollTop++;
-            if(window.pageYOffset){
-              window.pageYOffset = leader;
-        　　}else if(document.documentElement.scrollTop ){
+            if(document.documentElement.scrollTop ){
               document.documentElement.scrollTop = leader;
+        　　}else if(window.pageYOffset){
+              window.pageYOffset = leader;
         　　}else if(document.body.scrolltop){
               document.body.scrolltop = leader;
         　　}