Function detectValue

libs/echarts/echarts-en.simple.js:21203–21213

(val)

    }

    function detectValue(val) {
        var beStr = isString(val);
        // Consider usage convenience, '1', '2' will be treated as "number".
        // `isFinit('')` get `true`.
        if (val != null && isFinite(val) && val !== '') {
            return beStr ? BE_ORDINAL.Might : BE_ORDINAL.Not;
        }
        else if (beStr && val !== '-') {
            return BE_ORDINAL.Must;
        }
    }

    return BE_ORDINAL.Not;
}