如何正确丢失属性的错误？ [英] How to throw error properly for a missing property?

问题描述

    if (win.NS && win.NS.molist && win.NS.molist.utility) {
        NS = win.NS;
        NS.molist.dom = true;
    } else {
        throw "dom requires utility module";
    }

对于上面的代码段，抛出错误的正确方法是什么？ win.NS.molist.utility 不存在？

For the snippet above, what is the proper way to throw an error, if win.NS.molist.utility does not exist?

我可以把我想要显示的文本在调试器中显示？

Can I just throw up the text I want displayed to be shown in the debugger?

也许，我应该使用内置的错误类型之一？

Perhaps, I should use one of the built in error types?

也许一个新的TypeError ，我不知道有很多全局错误对象。

Maybe a new TypeError, I'm not sure as there are many global Errors objects.

推荐答案

您可以 throw 完全自定义错误。

function ModuleNotFoundError(message) {
  this.name = "ModuleNotFound";
  this.message = message || "dom does not have this module";
}
ModuleNotFoundError.prototype = new Error();
ModuleNotFoundError.prototype.constructor = ModuleNotFoundError;

throw new ModuleNotFoundError('win.NS.molist.utility');

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