javascript - Why does this json string fails to parse -

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Maybe I can not see it now, but why is it unable to parse Jason string? (Since its validity) 

  var content = $ .parseJSON ('{"foobar": "halo \" tow "}');   < p>  
   
 
 
 Because you are creating JSON in that string literally, you  \  needs to be avoided:  
  var content = $ .parseJSON ('{"foobar": "halo \\" tow "}'); Console.log (content);   
 
 Explanation:  
 In JSON,  " character  \  avoids the use of characters The following are completely valid JSON:  
  {"foobar": "hallo \" tow "}   
 Now, in your example, The values ​​within a JavaScript string were created:  
  '{"foobar": "hello \" tow "}'   
 This is a subtle Issue due to which the fact is that the javascript string  also  escape  " with the letter  \  characters Student. That is, the following string is literally:  
  ''   
 ... assumes the value:  
  "< Now, after re-implementing your example, we find that this string is really:  
  '{"foobar": "hello \" tow "} ''   
 ... really values:  
  {" foobar ":" hello "to"}   
 As you can see, we've lost our  \ . Fortunately, this task is easy, as  \  is also in the JavaScript string  \  characters Now, the modified string is literally:  
  '{"foobar": "hello \\" tow "}'   
 string is parsed as holding value:  
  {"foobar": "hallo \" tow "}   
 ... which can then be parsed as properly formatted JSON  
 You do not have this problem while reading from a  textarea  or as a result of an AJAX request That JSON value is defined by string Being o. Extra  \  is only required due to string literal syntax, and to avoid the competition that is spoken before  " first (okay, there really is not a competition) Going ... string literally always wins).

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