<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<h2 id="res"> </h2>
<script>
var a=100 ;
if (a=100);
{
document.getElementById ("res").innerHTML= "很好" ;
}
</script>
</body>
</html>
