//読み込む元の画像 var IMAGE = "http://jsrun.it/assets/x/y/1/B/xy1Bw.jpeg"; window.onload = function(){ function drawImage(imageObj){ var canvas = document.getElementById("world"); //canvasの横幅を設定 canvas.setAttribute("width",imageObj.width); //canvasの縦幅を設定 canvas.setAttribute("height",imageObj.height); var ctx = canvas.getContext("2d"); var x = 0; var y = 0; //canvas上に画像を表示 ctx.drawImage(imageObj,x,y); } v