`context.canvas.width` 和 `canvas.width` 有什么区别？
What is the difference between doing `context.canvas.width` and `canvas.width`?
当使用 HTML5 元素 Canvas 时，context.canvas.width 和 canvas.width 有什么区别？同样 ... .height.
两个名称一个引用对象
没有区别，因为 context.canvas 与 canvas 是同一个对象，假设您从 canvas.
创建了上下文
// They are the same when the strict equality is true.
const context = canvas.getContext("2d");
console.log(context.canvas === canvas); // >> true
变量context引用了一个CanvasRenderingContext2D with the property CanvasRenderingContext2D.canvas that references the HTMLCanvasElement, named canvas, used to get context via the call HTMLCanvasElement.getContext("2d")
当使用 HTML5 元素 Canvas 时，context.canvas.width 和 canvas.width 有什么区别？同样 ... .height.
两个名称一个引用对象
没有区别，因为 context.canvas 与 canvas 是同一个对象，假设您从 canvas.
// They are the same when the strict equality is true.
const context = canvas.getContext("2d");
console.log(context.canvas === canvas); // >> true
变量context引用了一个CanvasRenderingContext2D with the property CanvasRenderingContext2D.canvas that references the HTMLCanvasElement, named canvas, used to get context via the call HTMLCanvasElement.getContext("2d")