限制输入框中只允许数字

<input type="number" id="num1" name="entity.number" class="form-control" placeholder="请输入数量"
                               aria-describedby="basic-addon1" onkeyup="value=value.replace(/[^\0-9\.]/g,'')" onpaste="value=value.replace(/[^\0-9\.]/g,'')" oncontextmenu = "value=value.replace(/[^\0-9\.]/g,'')" />