有没有办法在函数中注入 try catch? [英] Is there a way to inject a try catch inside a function?

问题描述

也许你们中的一些人了解 AOP，在某些语言中使用 AOP 可以使您能够在方法执行之后、之前或期间注入代码等.

Maybe some of you know about AOP, in some languages using AOP can lead you to be able to inject code after, before, or while a method is executing,etc.

我想要的是在 Javascript 中应用相同的内容，我目前正在开发一个包含 300 多个 ajax 调用的大型应用程序，每次我需要对它们的 catch 语句进行一些更改时，我都必须修改一个接一个，很乏味.

What I want is to apply the same in Javascript, I am currently working on a massive app which has more than 300 ajax calls, and every time I need to do some change on the catch statement on them, I have to modify them one by one which is very tedious.

我想做的是:

functionName.before("try {")

functionName.after("} catch(ex){
//dostuff
}")

有可能吗?我知道每个函数中都有 .call 或参数对象之类的东西..它们看起来非常元函数 (AOP) 功能.

Is it possible? I know there are things like .call, or the arguments object inside every function..which seem pretty meta-function (AOP) functionalities.

推荐答案

不使用 before 和 after，但是 wrap 会起作用:

Not with before and after, but a wrap will work:

Function.prototype.wrapTry = function(handle) {
    var fn = this;
    return function() {
        try {
            return fn.apply(this, arguments);
        } catch(e) {
            return handle(e);
        }
    };
};

然后像这样使用

var safeFunction = functionName.wrapTry(doStuff);

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