local level = _branches:switchCase(85, function(ifElse)
    ifElse:add(function(it)
        return it >= 90 and it < 100
    end, function()
        return "优秀"
    end)
    ifElse:add(function(it)
        return it >= 80 and it < 90
    end, function()
        return "好"
    end)
    ifElse:add(function(it)
        return it >= 70 and it < 80
    end, function()
        return "良"
    end)
    ifElse:add(function(it)
        return it >= 60 and it < 70
    end, function()
        return "及格"
    end)
    ifElse:addDefault { "不及格" }
end)
_console:log(level)