<!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(5,8,1);
????document.write(sum);?????
</script>
</head>
<body>
</body>
</html>
為什么函數里面沒有return，在函數外面也可以輸出sum的值?
深淵大魔王4100108
2016-10-10 15:20:14
