Uncaught TypeError：未定义不是sencha touch中的函数

Question

I am new in sencha touch. So I am just try the code from this article .
The problem is when i run this code it gives this error:

Uncaught TypeError: undefined is not a function (TouchStart.js:2)

TouchStart.js :

// JavaScript Document
new Ext.Application({
name: 'Chat',
launch: function() {
var hello = new Ext.Container({
fullscreen: true,
html: '<div id="hello">Hello World</div>'
  });

this.viewport = hello;
  }
});

I try this but not found solution. so what is the problem?Thanks in advance.

Answer 1

Try this code

// JavaScript Document
new Ext.Application({
name: 'Chat',
launch: function() {
var hello = new Ext.Container({
fullscreen: true,
html: '<div id="hello">Hello World</div>'
  });

Ext.Application.viewport = hello;
  }
});