如何在Clojurescript中捕获任何Javascript异常？

Question

在我的通信层中,我需要能够捕获任何javascript异常,将其记录下来并像往常一样继续.在Clojurescript中捕获异常的当前语法规定我需要指定被捕获的异常的类型.

我试图在catch表单中使用nil,js/Error,js/object,它没有捕获任何javascript异常(可以将字符串作为对象的类型).

我很感激任何提示如何在Clojurescript中本地完成.

Answer 1

我在David Nolen的"Light Table ClojureScript Tutorial"中找到了另一个可能的答案

;; Error Handling
;; ============================================================================

;; Error handling in ClojureScript is relatively straightforward and more or
;; less similar to what is offered in JavaScript.

;; You can construct an error like this.

(js/Error. "Oops")

;; You can throw an error like this.

(throw (js/Error. "Oops"))

;; You can catch an error like this.

(try
  (throw (js/Error. "Oops"))
  (catch js/Error e
    e))

;; JavaScript unfortunately allows you to throw anything. You can handle
;; this in ClojureScript with the following.

(try
  (throw (js/Error. "Oops"))
  (catch :default e
    e))

Answer 2

它看起来像js/Object捕获它们(在https://himera.herokuapp.com上测试):

cljs.user> (try (throw (js/Error. "some error")) (catch js/Object e (str "Caught: " e)))
"Caught: Error: some error"
cljs.user> (try (throw "string error") (catch js/Object e (str "Caught: " e)))
"Caught: string error"
cljs.user> (try (js/eval "throw 'js error';") (catch js/Object e (str "Caught: " e)))
"Caught: js error"

有一点需要注意的是懒惰的序列.如果在延迟序列中抛出错误,则在退出try函数之前可能不会执行部分代码.例如:

cljs.user> (try (map #(if (zero? %) (throw "some error")) [1]))
(nil)
cljs.user> (try (map #(if (zero? %) (throw "some error")) [0]))
; script fails with "Uncaught some error"

在最后一种情况下,map创建一个惰性序列,try函数返回它.然后,当repl尝试将序列打印到控制台时,会对其进行评估,并在try表达式之外抛出错误.