'use strict' // 第一题 function sum (...rest) { var s = 0 while (rest.length !==0) { s += rest[0] rest.shitf() } return s }
'use strict' // 第二题 function area_of_circle (r, pi) { if (arguments.length == 1) { return r * r * 3.14 } else { return pi * r * r } }
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刘Sirer