现在在研究 css3 3d 空间效果，不过查阅了很多资料，对 perspective 和 translateZ 只有书面上的概念理解，如果使用 空间坐标系理解这两个属性呢。
同样还有个问题，在浏览器平面中，x轴的正方向是水平向右，y轴的正方向是垂直向下，那z轴呢？是垂直于显示器向外的方向还是向里的方向？？？
怪我咯2017-04-17 11:43:45
It is similar to the spatial rectangular coordinate system in previous mathematics textbooks, but the Y-axis is positive downward.
The Z axis is positive outward.
Perspective attributes are difficult to understand for beginners. The value of perspective is d in the figure below, and the value of translateZ is Z in the figure below. The blue part in the figure below is the final result displayed on the page. 
Read this article: http://cdn1.w3cplus.com/css3/transform-basic-property.html
