javaScript进阶篇5-4有参数的函数

源自：5-4 有参数的函数

javaScript进阶篇5-4有参数的函数

求指教！为什么这样写点击后出现undefined、undefined、undefined和：NaN?

另，请给出正确的答案？谢谢了！！

提问者：慕粉4340077 2016-11-27 16:06

个回答

慕粉1723541903

2016-11-27 16:15:16

已采纳

<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>函数传参</title>
<script type="text/JavaScript">
function add3(x,y,z)
{
sum = x + y +z;
document.write(x+"、"+y+"、"+z+"和:"+sum+"<br/>");
}
add3(5,8,3);
add3(7,1,4);
</script>
</head>
<body>
</body>
</html>

0
慕粉1854203318

2016-11-27 20:31:44

<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>函数传参</title>
<script type="text/JavaScript">
function add3(x,y,z)
{
sum = x + y +z;
document.write(x+"、"+y+"、"+z+"和:"+sum+"<br/>");
}
</script>
</head>
<body>
<form>
<input type="button" value="点我" onclick="add3(5,8,3)，add3(7,1,4)">
</form>
</body>
</html>

0
慕粉1854203318

2016-11-27 20:22:56

<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>函数传参</title>
<script type="text/JavaScript">
function add3(x,y,z)
{
sum = x + y +z;
document.write(x+"、"+y+"、"+z+"和:"+sum+"<br/>");
}
add3(5,8,3);
add3(7,1,4);
</script>
</head>
<body>
<form>
<input type="button" value="点我" onclick="add3(x,y,z)">
</form>
</body>
</html>

0