local x = 55
local level = _branches:ifElse(function(ifElse)
    ifElse:add(function()
        return x >= 90 and x < 100
    end, function()
        return "优秀"
    end)
    ifElse:add(function()
        return x >= 80 and x < 90
    end, function()
        return "好"
    end)
    ifElse:add(function()
        return x >= 70 and x < 80
    end, function()
        return "良"
    end)
    ifElse:add(function()
        return x >= 60 and x < 70
    end, function()
        return "及格"
    end)
    ifElse:addDefault(function()
        return "不及格"
    end)
end)
_console:log(level)