function sidEffecting(ary) { ary[] = ary[]; } function bar(a,b,c) { c = sidEffecting(arguments); return a + b + c; } bar(,,) 16.这是一个大坑,尤其是涉及到 ES6语法的时候.知识点: Functions/arguments 首先 The arguments object is an Array-like object corresponding to the argum…