function sum(...rest) { var a = 0; for(var i in rest){ //遍历rest数组中的元素 a +=parseInt(rest[i]); //将得到的元素转换成整数型，然后求和 } return a; }
var area; if(arguments.length == 1){ area = rr3.14; }else{ area = rrpi; } return area;
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w_玉芳
function sum(...rest) { var a = 0; for(var i in rest){ //遍历rest数组中的元素 a +=parseInt(rest[i]); //将得到的元素转换成整数型，然后求和 } return a; }
var area;
if(arguments.length == 1){ area = rr3.14; }else{ area = rrpi; } return area;