prototype+json ajax使用

Using JSON with Ajax

Using JSON with Ajax is very straightforward, simply invoke String#evalJSON on the transport’s responseText property:

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new Ajax.Request('/some_url', { 
  method:'get', 
  onSuccess: function(transport){ 
     var json = transport.responseText.evalJSON(); 
   } 
}); 

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If your data comes from an untrusted source, be sure to sanitize it:

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new Ajax.Request('/some_url', { 
  method:'get', 
  requestHeaders: {Accept: 'application/json'}, 
  onSuccess: function(transport){ 
    var json = transport.responseText.evalJSON(true); 
  } 
});