為什么會輸出2次呢？
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>函數傳參</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>
2019-05-06
調用了兩次函數啊?
add3(5,8,3) ;
add3(7,1,4);?