table th表头固定属性设定

/*设置滚动属性*/

tbody {

    display: block;

    max-height: 400px;

    overflow-y: scroll;

}



/*设置头与内容自动对齐*/

table thead,tfoot,tbody tr {

    display: table;

     100%;

    table-layout: fixed;

}



/*给滚动条预留宽度*/

table thead,tfoot {

     calc( 100% - 1em);

    background: #EFF0F5;

}