如何捕获JSON.parse()的异常? [英] How to catch exceptions of JSON.parse()?

问题描述

我必须解析的字符串来自FileReader()，它可能是有效json文件的内容，或者可能是无效的(例如script.js)...

The string I have to parse comes from a FileReader(), it may be the content of a valid json file or it may be invalid (eg a script.js) ...

问题是try/catch似乎不适用于JSON.parse()吗?

The problem is that try/catch doesn't seem to work with JSON.parse() ?

下面的代码无法捕获到文件无效的异常JSON.parse: unexpected character at line 1 column 1 of the JSON data.

The following code doesn't catch de exception JSON.parse: unexpected character at line 1 column 1 of the JSON data with an invalid file.

try
{
    var json = JSON.parse( content );
    ..
}
catch (e)
{
    ..
}

要进行第一次验证，我用( content.substr(0, 1) === '{' )测试了第一个字符，但我认为这是不够的.

To make a first validation I test the 1st character with ( content.substr(0, 1) === '{' ) but I suppose it's insufficient.

实现此目标的最佳方法是什么?

What is the best way to achieve this ?

这个问题是错误地提出的.

This question was asked by mistake.

推荐答案

try-catch可以与JSON.parse一起使用.在浏览器控制台中尝试以下操作，或使用SO的摘要功能:

try-catch does work with JSON.parse. Try the following in your browser console or use SO's snippet feature:

try{ 
  JSON.parse("b") 
} catch(e) { 
  document.writeln("Caught: " + e.message)
}

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