Hi Jarry,
Thanks for your reply.
Indeed, your example works fine because the default step size is 1.
However, if you change the step size to e.g. 5, you will see that for negative values the step size/interval is not 5, but 1 while changing the position of the slider.
<input class="easyui-slider" style="width:300px" data-options="
showTip:true,
min: -100,
max: 100,
step: 5,
rule: [-100,'|',-75,'|',-50,'|',-25,'|',0,'|',25,'|',50,'|',75,'|',100]
">