如何使用JS为canvas中的每个对象获取随机颜色？

var canvas = document.getElementById("myCanvas");
var ctx = canvas.getContext("2d");

function getRandomColor() {
  var r = Math.floor(Math.random() * 256);
  var g = Math.floor(Math.random() * 256);
  var b = Math.floor(Math.random() * 256);
  return "rgb(" + r + "," + g + "," + b + ")";
}

ctx.fillStyle = getRandomColor();

var canvas = document.getElementById("myCanvas");
var ctx = canvas.getContext("2d");

function getRandomColor() {
  var r = Math.floor(Math.random() * 256);
  var g = Math.floor(Math.random() * 256);
  var b = Math.floor(Math.random() * 256);
  return "rgb(" + r + "," + g + "," + b + ")";
}

// 绘制矩形
ctx.fillStyle = getRandomColor();
ctx.fillRect(10, 10, 50, 50);

// 绘制圆形
ctx.fillStyle = getRandomColor();
ctx.beginPath();
ctx.arc(100, 100, 50, 0, 2 * Math.PI);
ctx.fill();