javascript评估和对象评估 [英] javascript eval and object evaluation

问题描述

我有一个调试框架的一部分，该框架需要能够运行时间评估对象.

I have a part of a debugging framework that needs to be able to run time eval objects.

具体来说，如果我有这样的字符串"{a: 1, b:2}"，则需要将其评估为具有这些值的成员a和b的对象.但是，如果我eval("{a: 1, b:2}")这样做，它似乎会将其评估为声明，并说出有关非法标签的内容.

Specifically, if I have a string like this "{a: 1, b:2}" it needs to evaluate it into an object with members a and b with those values. However, if I do eval("{a: 1, b:2}") it seems to evaluate it as a statement, and says something about an illegal label.

我已经对其进行了黑客入侵，因此其评估结果如下:

I have hacked it so that it evaluates like this:

eval("var x=" + str + "; x;");

这似乎有效，但看起来像是个骇人听闻的骇客.关于如何做得更好的任何建议?

which seems to work, but seems like a horrible hack. Any suggestions on how to do this better?

(顺便说一句，我知道评估的危险，但这是调试框架的一部分，实际用户不会看到.)

(BTW, I am aware of the dangers of eval, but this is part of a debugging framework that will not be seen by actual users.)

推荐答案

您可以使用()将其解析为对象(而不是语句)，如下所示:

You can do it using () to have it parse it as an object, rather than a statement, like this:

eval("(" + str + ")");

但是，如果浏览器支持，则应首先使用JSON.parse().

Though, you should use JSON.parse() first, if the browser supports it.

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