function area_of_circle(r, pi) { var area;
if(arguments.length===1){ area=3.14rr;
}else if(arguments.length===2){ area=pirr; }else console.log('输入有误！') return area; }
// pi=pi||3.14 if(arguments[1]===undefined) pi=3.14; return pirr;
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单手虐学霸
function area_of_circle(r, pi) { var area;
if(arguments.length===1){ area=3.14rr;
}else if(arguments.length===2){ area=pirr; }else console.log('输入有误！') return area; }