​x
 
<!DOCTYPE html>
<html>
<body>
​
<p>NOT 运算符 (!) 为 false 语句返回 true，为 true 语句返回 false。</p>
​
<p id="demo"></p>
​
<script>
var x = 6;
var y = 3;
​
document.getElementById("demo").innerHTML = 
!(x === y) + "<br>" + 
!(x > y);
</script>
​
</body>
</html>
​