In JavaScript, eval returns JSON value appears error:invalid label solution

If you return a string in JSON format from the server side:

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{ SiteName: "111cn.net", SiteURL: "Http://www.111cn.net" }

When you run the eval in the script:

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var result = eval (o.responsetext); alert (result.sitename);

This will prompt: Error:invalid Label

In fact, our JSON format is not wrong, but in the eval, you have to enclose your JSON value in "()" brackets:

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var result = eval ("+ O.responsetext +")); alert (result.sitename);

Oh, this is often the easiest to ignore, but once there are mistakes, often the most headache: