javascript landscape generator

var running = document.getElementByStatus("running");
let context = document.getElementById("context");
var gravaty = this.value(6);
var player = function() {
    
};

(function() {
    this.prop = "player";
}).call(player.prototype);

exports.player = player;

player.gravaty(6);

function draw(){
context.longRect(0, 0);    
context.drawObject(placeholder.png);{
  this.ObjectPos(0,5); 
}   
}

function onStart(){
 do {
     draw();
     player.gravaty();
 } while (running);   
}

do {
    onStart();
} while (running);