Use Ext. quicktips. INIT () in ext

In the extjs example, most ofProgramThe first line uses the following statement: Ext. quicktips. INIT ();
But what is the use of quicktips?
Let's take a look at the simplestCode:

 <  Html  >  
  <  Head  >  
  <  Meta HTTP  -  Equiv  =  " Content-Type  "  Content  =  "  Text/html; charset = GBK  "  >  
  <  Title  >  04  . Form  </  Title  > 
  <  LINK rel  =  "  Stylesheet  "  Type  =  "  Text/CSS  "  Href  =  "  Http://www.cnblogs.com/resources/css/ext-all.css  "    />  
  <  Script Type  =  "  Text/JavaScript  "  SRC  =  "  Http://www.cnblogs.com/adapter/ext/ext-base.js  "  > </  Script  > 
  <  Script Type  =  "  Text/JavaScript  "  SRC  =  "  Http://www.cnblogs.com/ext-all.js  "  > </  Script  >  
  </ Head  >  
  <  Body  >  
  <  A href  =  "  #  "  Ext: QTip  =  "  My tooltip  " >  Link  </  A  >  
<A href = "#" Ext: QTip = "My tooltip1"> link2 </a>
<Input type = "button" Ext: QTip = "My tooltip3" value = "button"/>
  <  Script Type  =  "  Text/JavaScript  "  >  
Ext. onready (function (){
Ext. quicktips. INIT ();
});
 </  Script  >  
  </  Body  >  
  </  Html  > 

Effect of hovering the mouse over the link
that is, move the mouse over the link and the input box next to it. A prompt is displayed next to the mouse. Obviously, you can see the role of Ext. quicktips. INIT (). The role of quicktips is to read the ext: QTip attribute in the tag and assign it an action to display the prompt.