<!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,x,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>函数的第二个参数写错了:function add3(x,x,z)
大兄弟,仔细点,JS是弱语言,个别字母写错了是不会报错的