diff --git a/components/input/demo/tooltip.md b/components/input/demo/tooltip.md
index e8befee9a3ba..34738c0340a0 100644
--- a/components/input/demo/tooltip.md
+++ b/components/input/demo/tooltip.md
@@ -17,19 +17,7 @@ You can use the Input in conjunction with [Tooltip](/components/tooltip) compone
 import { Input, Tooltip } from 'antd';
 
 function formatNumber(value) {
-  value += '';
-  const list = value.split('.');
-  const prefix = list[0].charAt(0) === '-' ? '-' : '';
-  let num = prefix ? list[0].slice(1) : list[0];
-  let result = '';
-  while (num.length > 3) {
-    result = `,${num.slice(-3)}${result}`;
-    num = num.slice(0, num.length - 3);
-  }
-  if (num) {
-    result = num + result;
-  }
-  return `${prefix}${result}${list[1] ? `.${list[1]}` : ''}`;
+  return new Intl.NumberFormat().format(value);
 }
 
 class NumericInput extends React.Component {