​x
 
<!DOCTYPE html>
<html>
<head>
</head>
<body>
​
<p id="demo"></p>
​
<p>打开调试器后，script 元素内的代码应该在执行第三行之前停止执行。</p>
​
<script>
var x = 15 * 5;
debugger;
document.getElementById("demo").innerHTML = x;
</script>
​
</body>
</html>
​