javascript - 为什么这个错误会被忽略？

Question

我正在阅读 Eloquent JavaScript，其中有一部分代码我不理解。

for (;;) {
    try {
        var dir = promtDirection(" Where ?"); // ← typo !
        console.log(" You chose ", dir);
        break;
    } catch (e) {
        console.log(" Not a valid direction . Try again .");
    }
}  

书上说:

But we misspelled promptDirection , which will result in an “undefined variable” error. Because the catch block completely ignores its exception value ( e ), assuming it knows what the problem is, it wrongly treats the variable error as indicating bad input.

但是，如果它全面捕获异常，它不应该只捕获错字打印行产生的错误吗？

Answer 1

But if it is blanket-catching the exceptions, shouldn't it just catch the error generated by the typo

是的。

此时它会声称方向无效，这不是正确的错误。

and terminate?

不，它将进入 for 循环的下一次迭代(此时它将遇到相同的错误，无限重复)。