要求计算（11+33）*2的结果：
方法1：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<script type="text/javascript">
function sr(x,y){
var a=x+y;
return a
};
function sc(x,y){
var b=x*y;
return b
};
var bf=sr(11,33);
var bb=sc(bf,2);
document.write(bb);
</script>
</head>
<body>
</body>
</html>
返回值：88
方法2：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<script type="text/javascript">
function fuc1(x,y,z){
var a=x+y;
var c=fuc2(a,z); // a为前一个变量结果
return c;
};
function fuc2(x,y){
var b=x*y;
return b;
};
var bf=fuc1(11,33,2);
document.write(bf);
</script>
</head>
<body>
</body>
</html>
返回值：88