console 命令行工具 X clear

console

var map = document.getElementById("map");
var canvass = map.getContext("2d");
var i = 0;
setInterval(function () {
    canvass.clearRect(0, 0, 600, 600);
    canvass.fillRect(i, 0, 40, 40);
    canvass.stroke();
    i = i++;
    console.log("fasda" + i);
}, 200);

<html>
<canvas id="map" width="600" height="600" ></canvas>
<script id="main.js">

</script>

</html>