JSON.Parse（）准备好时调用函数吗？

Question

当JSON.Parse（）已解析文件中的所有对象时，是否可以使用事件来调用函数？

Answer 1

JSON.parse is synchronous. it returns the object corresponding to the given JSON text.

More about it from mozilla

now a good way of doing JSON.parse is shown below (inside a try-catch)

try {
    var data = JSON.parse(string);
    //data is the object,
    //convert to object is completed here. you can call a function here passing created object                  
}
catch (err) {
    //mark this error ?
}

Now there are discussions, about why JSON.parse is not async, like the ONE HERE

Answer 2

EDIT: Since question was changed.

JSON.parse() is a synchronous method, meaning that once it's called it will execute fully, before code execution continues.

var obj= JSON.parse(jsonString);
obj.prop; // obj is already accessible.

---

JSON.parse, doesn't actually load any files. It's also synchronous, meaning that code execution resume, after it has finished it's function, which is to parse a valid JSON string, to a JavaScript object.

If you want to execute a callback after a file has loaded, you'd need to look into requests, and ajax to be more precise. Here's a simple example using jQuery.

$.ajax({
  url: 'url/to/file.json',
  dataType: 'json'
}).done(yourCallback);