The sample shows how to set the increment step.
<div class="easyui-panel" style="width:100%;max-width:400px;padding:30px 60px;">
<div style="margin-bottom:20px">
<input class="easyui-numberspinner" value="1000" data-options="label:'List Price:',labelPosition:'top',increment:100" style="width:100%;">
</div>
<div style="margin-bottom:20px">
<input class="easyui-numberspinner" value="100" data-options="label:'Discount:',labelPosition:'top',increment:10,suffix:'%'" style="width:100%;">
</div>
<div style="margin-bottom:20px">
<input class="easyui-numberspinner" value="100" data-options="label:'Amount:',labelPosition:'top',increment:10" style="width:100%;">
</div>
</div>