<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
</head>
<body>
<script type="text/javascript">
var b=5;
(b == 5) ? a="true" : a="false";
document.write(" -- "+a);
</script>
<script type="text/javascript">
var b=true;
(b == false) ? a="true" : a="false";
document.write(" -- "+a);
</script>
<!--结果 true -->
<!--结果 false -->
</body>
</html>