Canvas
data
by xu xiaofei
HTML
<canvas id="myCanvas"></canvas>
JavaScript
var canvas=document.getElementById('myCanvas');
var ctx=canvas.getContext('2d');
ctx.fillStyle = 'blue';
ctx.moveTo(30,30);
ctx.lineTo(0,80);
ctx.lineTo(60,80)
ctx.lineTo(30,30)
ctx.stroke();
ctx.fill()