代码拉取完成，页面将自动刷新
场景如下：
Canvas 开启 SHOW ALL 模式，并设置你的设计分辨率，如：这里例子为 720 x 1280
Background 背景节点实现 SHOW ALL 模式下 缩放适配 ，操作如下：
操作后结果如下：
Content 内容节点实现 SHOW ALL 模式下 尺寸适配（实质为宽高重置），操作如下：
操作后结果如下：
本系列教程指引：
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