注意：v-deep .el-table th和v-deep .el-table tr的height会取最大值的一个
::v-deep .el-table th {
height: 20px !important;
padding: 0 !important;
}
::v-deep .el-table__row {
height: 40px !important;
padding: 0 !important;
}
::v-deep .el-table tr {
height: 40px !important;
padding: 0 ;
}
::v-deep .el-table td {
padding: 0 ;
}