html原生表格，实现左侧列固定

css类实现

tr:nth-child(even) {
    background-color: rgb(248, 247, 246);
}
tr:nth-child(odd) {
    background-color: #fff;
}
.dm_d1 {
    min-width: 0.2rem;
    position: sticky;
    left: 0;
    background: inherit;
}
.dm_d2 {
    width: 6vw;
    position: sticky;
    left: 2.25vw;
    background: inherit;
}
.dm_d3 {
    width: 3vw;
    position: sticky;
    left: 8.2vw;
    background: inherit;
}
.dm_d4 {
    width: 18vw;
    position: sticky;
    left: 11.2vw;
    background: inherit;
}
.dm_d5 {
    width: 4vw;
    position: sticky;
    left: 29.2vw;
    background: inherit;
}