function area_of_circle(r,pi){ if(arguments.length === 0){ return 0; }else if(typeof(r) != 'number'){ console.log('输入的半径值或者PI值有误，应为数字形式') return ; }else if(arguments.length === 1){ return 3.14rr; }else{ return pirr; } }
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忘记名字的苏
function area_of_circle(r,pi){ if(arguments.length === 0){ return 0; }else if(typeof(r) != 'number'){ console.log('输入的半径值或者PI值有误，应为数字形式') return ; }else if(arguments.length === 1){ return 3.14rr; }else{ return pirr; } }