如果你添加括号来显示JavaScript如何解释它，它会得到更清楚：

If you add parentheses to show how JavaScript is interpreting it, it gets much clearer:

alert( (3 > 2) > 1 );

让我们分开。首先，它评估 3> 2 。是的，三个大于两个。因此，您现在拥有：

Let's pick this apart. First, it evaluates 3 > 2. Yes, three is greater than two. Therefore, you now have this:

alert( true > 1 );

true 被强制转换为数字。这个数字恰好是 1 。 1> 1 显然是假的。因此，结果是：

true is coerced into a number. That number happens to be 1. 1 > 1 is obviously false. Therefore, the result is:

alert( false );