Javascript ?? ????? ??
Javascript ????
??? ?? ??? ???? ???? ?????. ??? ??? ??? ???? ? 5?, 10? ?? ? ??? ??? ??? ? ????. ??, ?? ??? ???? ????? ??? ??? ? ??? ?? ??? ? ??, ?? ?? ??? ????? ???? ??? ? ? ????.
?? ?? ??
?? ?? ??(){
?? ?? ????
}
??:
1. function ???? ??? ?????.
2. "?? ??"? ??? ???? ?????.
3. "?? ??"? ?? ??? ???? ??? ??
??? ?? ??? ?????.
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>函數(shù)</title>
<script type="text/javascript">
function sum(){
var a=10;
var b=5;
var c= a+b;
document.write(c);
}
</script>
</head>
<body>
</body>
</html>? ??? ????? ??? ??? ???? ??? ??? a+b? ?? ??? ????. ?? ??? ??? ??????
?? ?? ??
??: ?? ??();
??? ??? ??? ??? ??? ???? ????
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>函數(shù)</title>
<script type="text/javascript">
function sum(){
var a=10;
var b=5;
var c= a+b;
document.write(c);
}
sum();
</script>
</head>
<body>
</body>
</html>?? ???? ??? ??? ? ??? ?? ??? 15???.
