html控制數字輸入框加減的方法 class="form-control"

后面會有上下的加1減1的符號
使用step = "0.1" 可以修改每次加減的步長

 <div class="centerXY" style="background: #2128a266; box-shadow: 0px 1px 16px 0px #29449F;">
        <div class="input-group">
            <span class="input-group-addon">經度</span> <input type="number" class="form-control">
        </div>
        <div class="input-group"><span class="input-group-addon" >緯度</span> <input type="number"
                 class="form-control" >
        </div>
        <div class="input-group"><span class="input-group-addon" >高度</span> <input type="number"
                class="form-control" step="0.1" >
        </div>
        <div class="input-group text-right"><input id="btnCenterXY" type="button" class="btn btn-primary" value="確定">
        </div>
    </div>