// 颜色 从十六进制转为 rgba
    exports.convertHex = function(hex, opacity) {
        hex = hex.replace('#', '');
        r = parseInt(hex.substring(0, 2), 16);
        g = parseInt(hex.substring(2, 4), 16);
        b = parseInt(hex.substring(4, 6), 16);

        result = 'rgba(' + r + ',' + g + ',' + b + ',' + opacity / 100 + ')';
        return result;
    };