jquery控制输入框只能输入0或正整数

<input type="num" name="group_user_num"  class="form-control"  size="10" style="ime-mode:Disabled" placeholder="只能输入数字" value="2" onkeyup="this.value=this.value.replace(/\D/g,'').replace(/^0+(?=\d)/,'')" onkeyup="this.value=this.value.replace(/\D/g,'').replace(/^0+(?=\d)/,'')" />