el-table的上下筛选功能

el-table的sort-change事件可以监听到筛选的事件； 

会返回prop属性和order排序的顺序；

html：

js：

/**  * 排序改变*/sortChange(e) {    let params = {};    if (e.prop == "look_number" && e.order && e.order == "ascending") {        params.look_number = 1;    } else if (e.prop == "look_number" && e.order && e.order == "descending") {        params.look_number = 2;    } else if (e.prop == "number" && e.order && e.order == "ascending") {        params.number = 1;    } else if (e.prop == "number" && e.order && e.order == "descending") {        params.number = 2;    }}