Update demo bench.

Author: tangbc

demos/common/util.js

@@ -181,7 +181,6 @@ export const getRandomUser = () => {
         time: Random.date(),
         color: Random.color(),
         avatar: getRandomAvatar()
-        // avatar: `https://api.adorable.io/avatars/100/${Random.name()}`
     }
 }
 
@@ -219,6 +218,7 @@ export const debounce = (func, wait, immediate) => {
         }
     }
 }
+
 const oneThousand = 1000
 const typeMap = {
     1: oneThousand,

demos/item-mode/App.vue

@@ -11,6 +11,7 @@
             <virtual-list class="list"
                 :size="size"
                 :remain="remain"
+                :bench="30"
                 :start="start"
 
                 :item="item"

demos/item-mode/build.js

@@ -11,6 +11,7 @@
             <virtual-list class="list"
                 :size="size"
                 :remain="remain"
+                :bench="30"
                 :start="start"
 
                 :variable="getVariableHeight"

demos/variable-height/App.vue

@@ -11,6 +11,7 @@
             <virtual-list class="list"
                 :size="size"
                 :remain="remain"
+                :bench="30"
                 :start="start"
             >
                 <item