Canvas lets you paint the Web using JavaScript to render 2D shapes, bitmapped images, and advanced graphical effects. Each <canvas> element provides a graphics context with its own state and methods that make it easy to control and draw in.
Canvas可以让您使用JavaScript渲染2D图形、位图图像、以及先进的图形效果来绘制网页。每一个<canvas>元素提供一个带有自有状态和技术的graphics context可以很容易地进行控制和绘制。