Easyui popup called external JS function hint "Microsoft JScript Runtime Error: Missing object"

I met a very strange question yesterday.

I used Easyui to make a website, which has a page and a B page, I through the Easyui window function, a page popped a B page, in the B page, I used an external JS function C, I in the B page I also quoted this JS file, But every time the JS code goes to function C, it is prompt "Microsoft JScript runtime Error: Missing object", clearly quoted JS, why do you also hint that there is no object? Really damn, the results of a long time after the toss, I suddenly found that the original Easyui pop-up box is actually a div,b page is the equivalent of a div embedded in the b page, so .... So you must reference the external JS file in the A page!

Is such a simple question, stuck me for 2 hours ... It's so tangled.

Easyui popup called external JS function hint "Microsoft JScript Runtime Error: Missing object"