这对我来说很管用

.wrapper {
  overflow-x: auto;
  white-space: nowrap;
}

.wrapper table {
  width: auto;
  min-width: 100%;
}

<div class="wrapper">
   <table>...</table>
</div>

不管怎样，我找到的最好答案是: https://github.com/filamentgroup/tablesaw/issues/58#issuecomment-63966574

table.tablesaw
{
    table-layout: fixed;
    max-width: none;
    width: auto;
    min-width: 100%;
}

为div元素添加标签表，style="overflow-x:auto"

<div style="overflow-x:auto">
<table class="table table-bordered">
    <thead>
        <tr>
            <th><b>Name</b></th>
            <th><b>Username</b></th>
            <th><b>Email</b></th>
            <th><b>Avatar</b></th>
            <th><b>Status</b></th>
            <th><b>Action</b></th>
        </tr>
    </thead>
    <tbody>
    </tbody>
</table>

这解决方案似乎有点过头了。最简洁的方法是像这样用div来包装:

<div style="overflow-x:auto;">
  <table>
    ...
  </table>
</div>

https://www.w3schools.com/howto/howto_css_table_responsive.asp

//Representation of table
<div class="search-table-outter">
<table class="table table-responsive search-table inner">
</table>
</div>

//Css to make Horizontal Dropdown

<style>

    .search-table{table-layout: auto; margin:40px auto 0px auto; }
    .search-table, td, th {
        border-collapse: collapse;
    }
th{padding:20px 7px; font-size:15px; color:#444;}
td{padding:5px 10px; height:35px;}
    .search-table-outter { overflow-x: scroll; }
th, td { min-width: 200px; }


</style>

将表格插入到div中，这样表格就会有完整的长度

HTML

<div class="scroll">
 <table>  </table>
</div>   

CSS

.scroll{
    overflow-x: auto;
    white-space: nowrap;
}