infjump

local UIS = game:GetService("UserInputService")
local player = game.Players.LocalPlayer
local character
local humanoid

local canDoubleJump = false
local hasDoubleJumped = false
local oldPower
local time_delay = 0.2
local jump_multiplier = 1
function onJumpRequest()
	if not character or not humanoid or not character:IsDescendantOf(workspace) or humanoid:GetState() == Enum.HumanoidStateType.Dead then
		return
	end

	if canDoubleJump and not hasDoubleJumped then
		hasDoubleJumped = false
		--humanoid.JumpPower = oldPower * jump_multiplier
		humanoid:ChangeState(Enum.HumanoidStateType.Jumping)
	end
end

local function characterAdded(new)
	character = new
	humanoid = new:WaitForChild("Humanoid")
	hasDoubleJumped = false
	canDoubleJump = false
	oldPower = humanoid.JumpPower

	humanoid.StateChanged:connect(function(old, new)
		if new == Enum.HumanoidStateType.Landed then
			canDoubleJump = false
			hasDoubleJumped = false
			humanoid.JumpPower = oldPower
		elseif new == Enum.HumanoidStateType.Freefall then
		--	wait(time_delay)
			canDoubleJump = true
		end
	end)
end

if player.Character then
	characterAdded(player.Character)
end

player.CharacterAdded:connect(characterAdded)
UIS.JumpRequest:connect(onJumpRequest)