HTML5 uses canvas to draw triangles_html5 tutorial skills

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The code is as follows:

var canvas=document.getElementById("canvas");
var cxt= canvas.getContext("2d");
cxt.beginPath();
cxt.moveTo(250,50);
cxt.lineTo(200,200);
cxt.lineTo(300,300);
cxt.closePath();//Filling or closing requires closing the path before drawing
//Hollow triangle
cxt.strokeStyle="red";
cxt.stroke();
//Solid triangle
cxt.beginPath();
cxt.moveTo(350,50);
cxt.lineTo(300,200);
cxt.lineTo(400,300);
cxt. closePath();
cxt.fill();