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

问题描述

也许有些人对AOP有所了解，在某些使用AOP的语言中，可以使您能够在方法执行之后，执行之前或执行过程中注入代码.

我想要在Javascript中应用相同的代码，我目前正在开发一个具有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，都必须进行修改他们一个接一个地乏味.

我想做的是这样的:

functionName.before("try {")

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

有可能吗?我知道在每个函数中都存在诸如.call或arguments对象之类的东西.看起来像是元功能(AOP)功能.

解决方案

不适用于before和after，但是wrap可以使用:

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

然后像使用它

var safeFunction = functionName.wrapTry(doStuff);

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.

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.

What I want to do is something like :

functionName.before("try {")

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

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

解决方案

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);
        }
    };
};

Then use it like

var safeFunction = functionName.wrapTry(doStuff);

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