code review by hf: merge zhangzhen code to fixes home floor bugs

@@ -2185,23 +2185,11 @@ var $searchBox = $('.search-box'),
     $box = $('.box'),
     $indexSearch = $('.index-search'),
     $indexLogo = $('.index-logo'),
-    $channelLink = $('.index-channel a'),
-    $win = $(window),
-    $doc = $(document),
-    $appFloatLayer = $('#float-layer-app');
+    $channelLink = $('.index-channel a');
 
 var $search = $searchBox.children('input[type="text"]'),
-    $cancelSearch = $box.children('.no-search'),
-    $searchIcon = $searchBox.children('.search-icon');
-
-// variables for calculate the app download layer position
-var layerInit = false,
-    windowViewHeight = 0,
-    layerContentHeight = $appFloatLayer.height(),
-    layerPaddingTop = parseInt($appFloatLayer.css('padding-top')),
-    layerPaddingBottom = parseInt($appFloatLayer.css('padding-bottom')),
-    layerHeight = layerContentHeight + layerPaddingTop + layerPaddingBottom,
-    layerNewPos;
+        $cancelSearch = $box.children('.no-search'),
+        $searchIcon = $searchBox.children('.search-icon');
 
 require("js/common");
 
@@ -2257,43 +2245,6 @@ $channelLink.on('touchstart', function() {
     });
 });
 
-
-function updateLayerPosition() {
-    var winHeight = window.innerHeight,
-        bodyHeight = $doc.height(),
-        scrollTopPosition = $win.scrollTop();
-
-    if (layerInit) {
-
-        //keyboard is shown
-        if (windowViewHeight - winHeight > 200) {
-            if (scrollTopPosition + windowViewHeight + layerHeight >= bodyHeight) {
-                layerNewPos = 0;
-            } else {
-                layerNewPos = bodyHeight - windowViewHeight - scrollTopPosition - layerHeight;
-            }
-        } else {
-            layerNewPos = bodyHeight - winHeight - scrollTopPosition;
-        }
-
-    } else {
-        windowViewHeight = winHeight;
-        layerNewPos = bodyHeight - winHeight - scrollTopPosition + layerHeight;
-        layerInit = true;
-    }
-
-    $appFloatLayer.css({
-        position: 'relative',
-        bottom: layerNewPos + 'px'
-    });
-}
-
-$(window).scroll(function() {
-    window.requestAnimationFrame(updateLayerPosition);
-});
-
-$doc.on('ready', updateLayerPosition);
-
 });
 define("js/passport/entry", ["jquery"], function(require, exports, module){
 /**