表格 td 设置宽度无效问题

现在有个需求,就是表格的列不固定,都是动态加载的,想给每一列设置宽度,但是设置 width:100xp,没有效果,不过设置min-width:100px 就有效果了,table的宽度为 td的宽度和

            <div class="table-main">

                <table>
                    <thead>
                        <tr>
                            <th>昵称</th>
                            <th>昵称昵称昵称昵称昵称昵称昵称昵称昵称昵称昵称</th>
                            <th>昵称</th>
                            <th>昵称</th>
                            <th>昵称</th>
                            <th>昵称</th>
                            <th>昵称</th>
                            <th>昵称</th>
                            <th>昵称</th>
                            <th>昵称</th>
                            <th>昵称</th>
                            <th>昵称</th>
                            <th>昵称</th>
                            <th>昵称</th>
                            <th>昵称</th>
                        </tr>
                    </thead>
                    <tbody>
                        <tr>
                            <td style="min-width: 100px">张三丰</td>
                            <td style="min-width: 100px">张三丰</td>
                            <td style="min-width: 100px">张三丰</td>
                            <td style="min-width: 100px">张三丰</td>
                            <td style="min-width: 100px">张三丰</td>
                            <td style="min-width: 100px">张三丰</td>
                            <td style="min-width: 100px">张三丰</td>
                            <td style="min-width: 100px">张三丰</td>
                            <td style="min-width: 100px">张三丰</td>
                            <td style="min-width: 100px">张三丰</td>
                            <td style="min-width: 100px">张三丰</td>
                            <td style="min-width: 100px">张三丰</td>
                            <td style="min-width: 100px">张三丰</td>
                            <td style="min-width: 100px">张三丰</td>
                            <td style="min-width: 100px">张三丰</td>
                            <td style="min-width: 100px">张三丰</td>
                            <td style="min-width: 100px">张三丰</td>
                            <td style="min-width: 100px">张三丰</td>
                            <td style="min-width: 100px">张三丰</td>
                            <td style="min-width: 100px">张三丰</td>
                            <td style="min-width: 100px">张三丰</td>

                        </tr>

                    </tbody>
                </table>
            </div>