A good way to explain json returned by ajax (recommended)

Usually the format returned by ajax request is json or xml. If the returned json, it can be converted into a javascript object, as follows:

1. Controller implementation of ajax request

@RequestMapping
public void getLocations(@RequestParam String location, PrintWriter printWriter) { 
  if ((location)) { 
    return; 
  } 
  List<Location> locations = (location); 
  String json = (locations); 
  (json); 
  (); 
  (); 
}

Location is a bean containing multiple attributes, such as pName and zName.

2. Ajax handles request and returns value

$.ajax({ 
  type : "GET", 
  url : "/admin/location/", 
  data : "location=" + val, 
  success : function(msg) { 
    msg = eval(msg); 
    region = $("#region"); 
    (); 
    vHtml = "&lt;option value='none'&gt;Select area（Optional）&lt;/option&gt;"; 
    $.each(msg, function(i) { 
      var $bean = msg[i]; 
      vHtml += '&lt;option value="' + $ + '""&gt;'
          + $ + '&lt;/option&gt;'; 
    }); 
    (vHtml); 
  } 
});

msg is originally a json string. It uses the eval function to convert the string into a javascript object, so that the property value can be obtained like an object.

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