您如何冒泡错误，以便可以将它们捕获在同一try/catch块中? [英] How can you bubble up errors so they can be caught in the same try/catch block?

问题描述

我有一个带有引发错误的函数的对象，

I've got an object with functions that throw errors,

myObj = {
  ini:function(){
    this.f();
  },
  f:function(){
   throw new Error();
  } 
};

但是我只想在创建对象的地方捕获异常

but I only want to catch the exceptions where the object is created

try{
  var o = new myObj();
}catch(err){
  alert("error!");
}

看来我必须到处都有try/catch块=/才能捕获不同功能范围内的错误事件

it looks like i have to have try/catch blocks everywhere =/ to capture the error event in different function scopes

try{
    myObj = {
      ini:function(){
        try{
          this.f();
        }catch(err){
         alert("f threw an err");
        }
      },
      f:function(){
       throw new Error();
      } 
    };
}catch(err){
 alert("error happend while crating Obj");
}

但是我只想从一个地方捕获=/我该怎么做?

But I only want to capture from one place =/ How do I do this?

推荐答案

让您的函数抛出特定类型的对象，然后在catch块中检查 if(err instanceof MyExceptionObj)和适当处理，否则将其扔掉.

Have your function throw a specific type of object, and then in your catch block check to see if (err instanceof MyExceptionObj) and handle appropriately, otherwise re-throw it.

通过重新抛出，我的意思是:

By re-throw I mean:

如果捕获的异常对象不是您可以处理的对象，则应重新抛出该对象，以使任何捕获块都有进一步的机会来处理它.如果不执行任何操作，浏览器将捕获该错误并显示JS错误.

If the caught exception object isn't one you can handle, you should re-throw it to give any catch blocks further up a chance to handle it. If none do, the browser will catch it and display a JS error.

try {
   if ($.browser.msie) {
      throw new UnsupportedBrowserException();
   }
} catch (ex) {
   if (ex instanceof UnsupportedBrowserException) {
      alert('Your browser isn't supported.');
   } else {
      // We don't know how to handle this exception, throw it back.
      throw ex;
   }
}

在现实世界中，您可能不会这样做.

You probably wouldn't do this in the real world.

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