ratu9 - 経済統計練習帳

<script>
 
 
function sample(){
 
 var timer;
var delay = 100;
 
p=0; 
var loop = function () {
 
 p=p+10;
 if(p>500)p=0;
 
    paint();
 
    clearTimeout(timer);
    timer = setTimeout(loop, delay);
}
 
loop();
 
 
 
 
}
 
function paint(){
 var canv = document.getElementById('memo');
 
  var ctx = canv.getContext('2d');
 
 ctx.fillStyle = "white";
ctx.fillRect(0, 0, 500, 500);
 ctx.fillStyle = "red";
ctx.fillRect(250, p, 10, 10);
 
 
}
 
</script>