有人请告诉我$ .parseJSON有什么问题[javascript / jquery]

Question

Here is my tested result. I run my app, I get the "Hello" alert. But I don't get "After parse JSON" alert.

When I comment out the var rstList = $.parseJSON(data); line, "After parse JSON" alert prompted correctly.

I have check many document and reference but couldn't find out what is wrong with my $.parseJSON() . Please advice, thank you.

//Show restaurant listing
$('#restaurantList').on("pagebeforecreate", function() {
    $.getJSON("http://mydomain/api/restaurant", function( data ) {
    alert('Hello');
    var rstList = $.parseJSON(data);
    alert('After parse JSON');

    });
});

Answer 1

Contrary to what the name implies, $.getJSON doesn't give you some JSON but the result of the parsing.

From the documentation :

The success callback is passed the returned data, which is typically a JavaScript object or array as defined by the JSON structure and parsed using the $.parseJSON() method.

You data is already parsed, don't parse it.

BTW, as Niet commented, you should have looked at the console to have a little more information on the error halting your script's execution. See Using the console .

Answer 2

Because you are trying to parse a json object again. Which causes the error. $.getJSON will return the json object. You dont need to parse it again