Code Javascript求和 <script language ="javascript" type ="text/javascript"> function Sum(a) { if ((a instanceof Array) || (a &&typeof a =="object"&&"length"in a)) { var total =0; for (var i =0; i < a.length; i++) { var element = a[i]; if (!element) continue; if (typeof element =="number") total += element; elsethrownew Error("All element must be numbers!"); } return total; } elsethrownew Error("Argument must be an array!!"); } var a = [1, 2, 3]; var sumNumber = Sum(a); document.write(sumNumber); </script>