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function draw() {
var canvas = document.getElementById("cv");
if (canvas.getContext) {
var ctx = canvas.getContext("2d");
// Quadratric curves example ctx.beginPath();
ctx.moveTo(75,25);
ctx.quadraticCurveTo(25,25,25,62.5);
ctx.quadraticCurveTo(25,100,50,100);
ctx.quadraticCurveTo(50,120,30,125);
ctx.quadraticCurveTo(60,120,65,100);
ctx.quadraticCurveTo(125,100,125,62.5);
ctx.quadraticCurveTo(125,25,75,25);
ctx.stroke();
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<title>用贝塞尔曲线绘制聊天气泡</title>
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