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Ext jsonStore gets the value of the question.
Because the externally loaded data is asynchronous

Data was not returned during alert, and the result must be 0.

Look at the results:

No automatic loading

use

Shops. Load({callback:function(record,a,b){

alert(record . data . length);

}});

It's all empty. I've met it, too. Nothing has moved, so I'm fine.

I suggest you keep only the most basic functions, or try another environment. The code itself is absolutely fine!