[TOC]
## 阻止事件冒泡
> event.preventDefault 阻止事件的默认动作
```
<a href="https://jquery.com">default click action is prevented</a>
<div id="log"></div>
$( "a" ).click(function( event ) {
event.preventDefault();
$( "div" )
.append( "default " + event.type + " prevented" )
.appendTo( "#log" );
});
```
