JS how to infer whether an object {} is an empty object, no matter what property

JS how to infer whether an object {} is an empty object, no matter what property

Some time ago with JS wrote a similar "Angularjs" for data binding things, the function is relatively simple,

Usually it should come in an array of ArrayList JSON objects,

But sometimes a JSON object is returned through an Ajax method call, not an array!

The following code is used in order to be compatible with this situation:

if (typeof model.rows = = = = "Object" &&! Model.rows instanceof Array) {model.rows = [model.rows];}

This code found a bug in the process of later use, that is, when

Model.rows = {};

, it is still treated as a valid object, data binding, it can be imagined that all the data is empty.

How to resolve:

So how do we solve the problem?

The first habit is to search first, but the results are DOM-related, passable!

This reminds me of the way I wrote the properties of the JS object, which can be used here!

The code is as follows:

if (typeof model.rows = = = = "Object" &&! Model.rows instanceof Array) {var hasprop = False;for (var prop in model.rows) {hasprop = True;break;} if (hasprop) {model.rows = [model.rows];} Else{throw "Model.rows is empty object"; return false;}}

The code is very easy, do not write stare.

JS how to infer whether an object {} is an empty object, no matter what property