fixed: 列表页蒙层ios击穿滚动

@@ -181,11 +181,9 @@ export default {
         },
         showLay() {
             this.bodyElStyle = document.querySelector('body').style;
-            this.bodyElStyle.position = 'absolute';
-            this.bodyElStyle.top = 0;
-            this.bodyElStyle.left = 0;
-            this.bodyElStyle.right = 0;
-            this.bodyElStyle.bottom = 0;
+            this.bodyElStyle.position = 'fixed';
+            this.bodyElStyle.width = '100%';
+            this.bodyElStyle.height = '100%';
             this.bodyElStyle.overflow = 'hidden';
             this.layFlag = true;
         },