fixBug[waves.js]: wave's position (#949)

* fixBug[waves.js]-wave's position

* fix[waves.js]-wave's position

Author: shufangyi

Diff for: src/directive/waves/waves.js

@@ -29,8 +29,8 @@ export default{
             ripple.style.left = (rect.width / 2 - ripple.offsetWidth / 2) + 'px'
             break
           default:
-            ripple.style.top = (e.pageY - rect.top - ripple.offsetHeight / 2 - document.body.scrollTop) + 'px'
-            ripple.style.left = (e.pageX - rect.left - ripple.offsetWidth / 2 - document.body.scrollLeft) + 'px'
+            ripple.style.top = (e.pageY - rect.top - ripple.offsetHeight / 2 - document.documentElement.scrollTop || document.body.scrollTop) + 'px'
+            ripple.style.left = (e.pageX - rect.left - ripple.offsetWidth / 2 - document.documentElement.scrollLeft || document.body.scrollLeft) + 'px'
         }
         ripple.style.backgroundColor = opts.color
         ripple.className = 'waves-ripple z-active'