使用JQuery解析Google Calendar v3 API JSON会在IE中返回undefined

The following code works Chrome, Firefox, Safari but in IE11 returns undefined. I've enabled "Access data across domains" within my IE settings and no longer get a CORS warning in the IE dev console, but instead I get this message. SCRIPT5007: Unable to get property 'dateTime' of undefined or null referenceThe following code works Chrome, Firefox, Safar