Three ways to convert strings into JSON in JS __js

In the development project using AJAX, it is often necessary to return the JSON-formatted string to the front end and parse the front end into a JS object (JSON).

ECMA-262 (E3) did not write the JSON concept into the standard, but fortunately in ECMA-262 (E5) The concept of JSON was formally introduced, including global JSON objects and date Tojson methods.

1,eval Way of parsing, I am afraid this is the earliest analytic way. As follows:
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function Strtojson (str) {
var json = eval (' (' + str + ') ');
return JSON;
}

Remember to keep the parentheses on both sides of the Str.
2,new function form, more bizarre Oh. As follows
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function Strtojson (str) {
var json = (new Function ("return" + str)) ();
return JSON;
}

3, use the global JSON object as follows:
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function Strtojson (str) {
return Json.parse (str);
}

Currently IE8 (S)/FIREFOX3.5+/CHROME4/SAFARI4/OPERA10 has implemented the method, and the following are some of the data: http://blogs.msdn.com/ie/archive/2008/09/10/ Native-json-in-ie8.aspx Https://developer.mozilla.org/en/Using_JSON_in_Firefox
The use of json.parse requires strict adherence to the JSON specification, such as a property that is enclosed in quotes, as follows
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var str = ' {name: ' Jack '} ';
var obj = json.parse (str); --> Parse Error

Name is not enclosed in quotation marks, and parsing fails with the exception being thrown in all browsers using Json.parse. The first two ways are fine.