????：<!DOCTYPE html><html> <head> <meta charset="utf-8"> <title>js變量</
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>js變量</title>
</head>
<body>
<script>
var a="3";
document.write(a+"</br>")
var b=4;
document.write(b)
</script>
</body>
</html>
?? ???：韋小寶?? ??：2019-03-09 13:05:50
???? ??：寫(xiě)的還算是可以 注意聲明變量時(shí)變量名的命名規(guī)則哦