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Get the current degree of rotation and add 90 to it instead of setting the world to 90

1. That’s because your perspective has never changed

This question is easy to say, just like the answers of the two people above, neither simple nor simple.
If you write more standardizedly.

//獲取元素
var op = document.getElementById("box");

//每次點(diǎn)擊獲取其旋轉(zhuǎn)的角度
//這里由于需要獲取transform：ratate屬性是比較麻煩的。
//我們記為操作Action,得到結(jié)果為nCurrRotate。

//設(shè)置新的值
box.style.transform='rotate('+ (nCurrRotate+90) +'deg)';

Action

Action reference here: [1]: http://blog.5ibc.net/p/25577....