如何在jQuery中使用JSON？

I'm working at an app which would make a POST ajax request to a PHP script on my server. The script would query the database and return a row of records, as an array. (One array for each row, containing elements such as id, title, etc). I then want to use json_encode() to encode this array, and pass it back to the javascript which will use it to display the records.

1) How can I return the JSON encoded string to the javascript? 2) How will the javascript loop through the rows and access their fields?

To get JSON with jQuery, just use jQuery.getJSON(). Alternatively, you can use any other AJAX tool and then just eval() the json to get a javascript object.

To loop through an array, I usually use jQuery.each():

var recordList = yourMethodToGetRecordListWithAjax();

jQuery.each(recordList, function()
{
    alert(this.Name); // For example
});

You can return the JSON encoded string to the JS by echoing it with a Content-Type of application/json.

See above answer for the rest.

1) in the php script:

$return["foo"]  = "bar";
$return["blah"] = "bleg";
print json_encode($return);

2) in the javascript:

$.ajax({
  type: "POST",
  url: URL,
  cache: false,
  data: values,
  dataType: 'json',
  success: function(json) {
    var foo = json.foo;
    if (json.blah == "bleg") {
      // do stuff 
    }
  } // end success function
}); // end ajax call