javascript landscape generator

1var running = document.getElementByStatus("running");
2let context = document.getElementById("context");
3var gravaty = this.value(6);
4var player = function() {
5    
6};
7
8(function() {
9    this.prop = "player";
10}).call(player.prototype);
11
12exports.player = player;
13
14player.gravaty(6);
15
16function draw(){
17context.longRect(0, 0);    
18context.drawObject(placeholder.png);{
19  this.ObjectPos(0,5); 
20}   
21}
22
23function onStart(){
24 do {
25     draw();
26     player.gravaty();
27 } while (running);   
28}
29
30do {
31    onStart();
32} while (running);