Question

Through AJAX I receive random string (built at RUNTIME on the server) that contain some JavaScript code like:

Plugins.add('test', function()
 { 
        return
            {
                html: '<div>test</div>',//EDITED
                width: 200
            }
 });//EDITED

In the client I want to be able to execute this code. I tried using eval function like this

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

but I get error. I removed all "\r\n" and removed the last ";"(semicolon) and after that eval function succeeded. But, If I add some comment to the code above, eval fails.

How I can run the code from the string?

Answer 1

new Function(str)()

or for JSON:

new Function('return ' + str)();

If it happens to fit your needs any better than eval. It’s still evil like eval.