object has no hasOwnProperty method (i.e. it's undefined) – IE8-Collection of common programming errors

This example is from IE8, but the same return is from IE6+ and most other IE browsers.

IE before #9 does not define it for host objects

var o=window;// or document or document elements
o.hasOwnProperty

/*  returned value: (undefined)
undefined
*/

Originally posted 2013-11-09 19:03:18.