复制代码代码如下:
<Html>
<body>
<canvas id = "canvas" style = "latar belakang-warna: #000;"/>
<script>
posisi fungsi (x, y) {
this.x = x;
this.y = y;
}
var canvas = document.geteLementById ('canvas'),
ctx = canvas.getContext ('2d');
lebar = canvas.width,
tinggi = kanvas.
ctx.fillstyle = "#ff0000";
ctx.font = "20px Arial";
ctx.filltext ("妈妈", 10,50);
var pixs = ctx.getImagedata (0,0, lebar, tinggi) .data;
var piksel = array baru ();
untuk (var i = 0; i <pixs.length; i+= 4)
{
var r = pixs [i],
g = pixs [i+1],
b = pixs [i+2],
a = pixs [i+3];
if (r! = 0 || g! = 0 || b! = 0) {
var x = i%400;
var y = i/400;
Piksel.push (posisi baru (x, y));
}
}
</script>
</body>
</html>