https://blog.csdn.net/flyingpig2016/article/details/52895620 深入理解JavaScript中的堆与栈 、浅拷贝与深拷贝
https://segmentfault.com/a/1190000017543088 bind函数作用
https://blog.csdn.net/wangchengiii/article/details/77926868 常见布局
