匿名Format Tip Information
This sample shows how to format tip information.
示例：
代码：
<input class="easyui-slider" value="12" style="width:300px" data-options="
showTip: true,
rule: [0,'|',25,'|',50,'|',75,'|',100],
tipFormatter: function(value){
return value+'px';
},
onChange: function(value){
$('#ff').css('font-size', value);
}">
<div id="ff" style="margin-top:50px;font-size:12px">jQuery EasyUI</div>