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当改变窗口大小不会填补画布梯度...调整大小的浏览器窗口填充画布动态
window.addEventListener('resize', resizeCanvas, false);
function resizeCanvas() {
canvas.width = window.innerWidth;
canvas.height = window.innerHeight;
draw();
}
resizeCanvas();
http://codepen.io/tworog/pen/jVoYrz
请帮助。