javaScript進(jìn)階篇5-4有參數(shù)的函數(shù)
求指教！為什么這樣寫點(diǎn)擊后出現(xiàn)undefined、undefined、undefined和：NaN?
另，請(qǐng)給出正確的答案？謝謝了！！
慕粉4340077
2016-11-27
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2016-11-27
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>函數(shù)傳參</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>
2016-11-27
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>函數(shù)傳參</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="點(diǎn)我" onclick="add3(5,8,3)，add3(7,1,4)">
</form>
</body>
</html>
2016-11-27
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>函數(shù)傳參</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="點(diǎn)我" onclick="add3(x,y,z)">
</form>
</body>
</html>