Yoomin

Forget about the arguments object. The rest parameter is always a better option because: 这里说的不是`...rest`参数么? 收集额外参数为一个数组

my solution for the exercise, which used spread operator to gather function arguments: [link here](https://www.typescriptlang.org/play?ssl=44&ssc=6&pln=40&pc=1#code/C4TwDgpgBAggxsAlgewHZQLwFgBQUoA+UA3rvvqJAFxQBEAkgHL0AqtZUAvh0aXuZQg1aAZQCajAMLt+3frw4VwQugBkA8gHEA+kxnkoEALYBDRABsYAEysAnCAGcHNB8FuJUAcw5z8C-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-TmACYjwBOObXq-Xg8nuYyTiTnsdSbTWZzedMVi0O+vaGtU6gAEYAFZLHa1y3GCEYwtmOpokhyJYgahbQMgkE1OBUF8AWnB7EAA)

this应该就是典型的动态作用域吧.

see https://github.com/shadowsocks/ShadowsocksX-NG/issues/1185

模仿着实现了一个, 算法复杂了一点, 主要是触摸到达新的元素时才触发emitter, 避免`touchchmove`的频繁触发, 能节省一定性能开销...但我做了一天还多...另外网易还招前端么.

nice work by the way, for now i'll just scrap all the comments and sort them manually...