框架默认选中颜色太淡，直接进源码修改。
.el-table--striped .el-table__body tr.el-table__row--striped td{background:#FAFAFA}.el-table--striped .el-table__body tr.el-table__row--striped.current-row td,.el-table__body tr.current-row>td,.el-table__body tr.hover-row.current-row>td,.el-table__body tr.hover-row.el-table__row--striped.current-row>td,.el-table__body tr.hover-row.el-table__row--striped>td,.el-table__body tr.hover-row>td{background-color:orange}
