为什么运行没有结果?
<!DOCTYPE HTML> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>返回值函数</title> <script type="text/javascript"> function app2(x,y) { var sum,x,y; sum = x * y; return sum; } var req1=add2(5,6); var req2=add2(2,3); var sumq=add2(req1,req2); document.write("req1的值:"+req1+"<br/>"); document.write("req2的值:"+req2+"<br/>"); document.write(req1+"与"+req2+"和:"+sumq); </script> </head> <body> </body> </html>
add2函数未定义
你把add2换成app2再试试。
函数名写错了
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>返回值函数</title>
<script type="text/javascript">
function app2(x,y)
{ var sum,x,y;
sum = x * y;
return sum
}
req1 = app2(5,6)
req2 = app2(2,3)
sumq = req1+req2
document.write("req1的值:"+req1+"<br/>");
document.write("req2的值:"+req2+"<br/>");
document.write(req1+"与"+req2+"和:"+sumq);
</script>
</head>
<body>
</body>
</html>