var sortName = '';  //排序名稱 string
var sortOrder = ''; //順排逆排 string

//設定資料排序的依據
function setSort(columnName) {
    if (sortName != columnName) {
        sortName = columnName;
        sortOrder = 'ASC';
    }
    else {
        if (sortOrder == 'ASC') {
            sortOrder = 'DESC';
        } else {
            sortOrder = 'ASC';
        }
    }
}

function endSort() {
    var titleName = $("#FN_" + sortName).text();
    if (sortOrder == 'ASC') {
        $("#FN_" + sortName).text("").append("▽" + titleName);
    } else {
        $("#FN_" + sortName).text("").append("△" + titleName);
    }
}