<body>
<div id="canvas-warp">
<canvas id="canvas" style="display: block; margin: 200px auto;">
你的浏览器居然不支持Canvas!
</canvas>
</div>
<script>
window.onload = function () {
var canvas = document.getElementById("canvas");
canvas.width = 400;
canvas.height = 400;
//获取上下文
var context = canvas.getContext("2d");
//用于画有填充色圆的函数 参数分别为圆心坐标 ，半径，起始与终止位置，线颜色，填充颜色
function drawCircle(x2, y2, r2, a2, b2, lineColor, FillColor) {
context.beginPath();
context.arc(x2, y2, r2, a2, b2 * Math.PI);
context.strokeStyle = lineColor;
context.fillStyle = FillColor;
context.fill(); //确认填充
context.stroke();
};
//用于画圆弧函数 默认线条为黑色 无填充 参数分别为：圆心x坐标，圆心y坐标，半径，开始位置，终止位置
function drawsArc(x, y, r, l1, l2) {
context.beginPath();
context.arc(x, y, r, l1 * Math.PI, l2 * Math.PI);
context.strokeStyle = "black";
context.stroke();
};
//用于画眼睛的函数
function darwEyes(x1, y1, a1, b1) { //参数分别为椭圆圆心位置 长轴 短轴
context.strokeStyle = "#754924"
ParamEllipse(context, x1, y1, a1, b1); //椭圆
function ParamEllipse(context, x, y, a, b) {
//使每次循环所绘制的路径（弧线）接近1像素
var step = (a > b) ? 1 / a : 1 / b;
context.beginPath();
context.moveTo(x + a, y); //从椭圆的左端点开始绘制
for (var i = 0; i < 2 * Math.PI; i += step) {
//参数为i，表示度数（弧度）
context.lineTo(x + a * Math.cos(i), y + b * Math.sin(i));
}
context.closePath();
context.fillStyle = "#754924";
context.fill();
context.stroke();
};
};
//脸
drawCircle(200, 200, 200, 0, 2, "#EEE685", "#FCF200");
//左眼
context.strokeStyle = "#754924"
darwEyes(116, 130, 18, 25);
drawCircle(110, 127, 12, 0, 2, "#754924", "#F5F5F5");
//右眼
darwEyes(296, 130, 18, 25);
drawCircle(290, 127, 12, 0, 2, "#754924", "#F5F5F5");
//左眉毛
drawsArc(100, 100, 50, 1.3, 1.7);
//右眉毛
drawsArc(300, 100, 50, 1.3, 1.7);
//嘴巴
drawsArc(200, 120, 180, 0.3, 0.7);
}
</script>
</body>
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