bad platformer

var left=0;
var right=0;
var down=0;
var up=0;
var playerspeed=3;
var xpos=10;
var ypos=235;
var jumpspeed=6;

(function () {
	var sky = document.createElement('div');
	var body = document.getElementsByTagName('body')[0];
	body.appendChild(sky);

	sky.style.position = 'fixed';
	sky.style.top = '0px';
	sky.style.left = '0px';
	sky.style.margin = '10px';
	sky.style.paddingTop = '10px';
	sky.style.width = '300px';
	sky.style.height = '300px';
	sky.style.zIndex = 10000;
	sky.style.opacity = 1;
	sky.style.color = 'blue';
	sky.style.backgroundColor = 'blue';
	sky.style.border = '0px solid white';
	sky.style.textAlign = 'center';
	sky.id = 'sky';
	sky.style.display = 'block';
}());

function colliding(rect1x,rect1y,rect1width,rect1height,rect2x,rect2y,rect2width,rect2height){
    return (rect1x < rect2x + rect2width && rect1x + rect1width > rect2x && rect1y < rect2y + rect2height && rect1y + rect1height > rect2y);
}

setInterval(colliding,5);
(function () {
	var char = document.createElement('div');
	var body = document.getElementsByTagName('body')[0];
	body.appendChild(char);

	char.style.position = 'fixed';
	char.style.top = ''+ypos+'px';
	char.style.left = ''+xpos+'px';
	char.style.margin = '10px';
	char.style.paddingTop = '10px';
	char.style.width = '15px';
	char.style.height = '15px';
	char.style.zIndex = 10000;
	char.style.opacity = 1;
	char.style.color = 'black';
	char.style.backgroundColor = 'black';
	char.style.border = '0px solid white';
	char.style.textAlign = 'center';
	char.id = 'char';
	char.style.display = 'block';
}());

(function () {
	var ground = document.createElement('div');
	var body = document.getElementsByTagName('body')[0];
	body.appendChild(ground);

	ground.style.position = 'fixed';
	ground.style.top = '250px';
	ground.style.left = '0px';
	ground.style.margin = '10px';
	ground.style.paddingTop = '10px';
	ground.style.width = '300px';
	ground.style.height = '50px';
	ground.style.zIndex = 10000;
	ground.style.opacity = 1;
	ground.style.color = 'blue';
	ground.style.backgroundColor = 'green';
	ground.style.border = '0px solid white';
	ground.style.textAlign = 'center';
	ground.id = 'ground';
	ground.style.display = 'block';
}());

function move(){
	if (right==1){
		if (xpos+playerspeed>=285){
		}
		else{
			xpos=xpos+playerspeed;
			char.style.left = ''+xpos+'px';
		}
	}	
	if (left==1){
		if (xpos-playerspeed<=0){
		}
		else{
			xpos=xpos-playerspeed;
			char.style.left = ''+xpos+'px';
		}
	}
	if (up==1){
		ypos=ypos+jumpspeed;
		if (jumpspeed>=0){
			jumpspeed=jumpspeed-0.5;
		}
	}
	if (up==-1){
		jumpspeed=0;
		ypos=ypos-jumpspeed;
		if (jumpspeed<=0){
			jumpspeed=jumpspeed+0.5;
		}
	}
}

function jump(){
	up=-1;
	function waiting(){
		up=1;
	}
	waiting();
	function waiting2(){
		up=-1;
		function continue1(){
			colliding=colliding(xpos,ypos,15,15,0,250,300,50);
			if (colliding){
				up=0;
				clearInterval(continue1);
			}
		}
		setInterval(continue1,15);
	}

	setTimeout(waiting2,700);
}

function update(){
	char.style.top = ''+ypos+'px';
	char.style.left = ''+xpos+'px';
}
setInterval(update,2);
window.addEventListener("keydown",function(event){ 
	if(event.key=="ArrowRight"){ 
		right=1; 
	}
	if(event.key=="ArrowLeft"){ 
		left=1; 
	}
	if(event.key=="ArrowUp"){ 
        	jump();
	}
});

window.addEventListener("keyup",function(event){ 
	if(event.key=="ArrowRight"){ 
		right=0; 
	}
	if(event.key=="ArrowLeft"){ 
		left=0; 
	}
});

setInterval(move,15);