bug:jquery1.8.3, "in" operand is invalid: Object is missing

 inarray: function (elem, arr, i)  {var len;if  (arr)  {if  (core_ INDEXOF)  {return core_indexof.call (arr, elem, i);} Len = arr.length;i = i ? i < 0 ? math.max (0, len  + i)  : i : 0;// fix bug when ie8 ; The purpose of these two lines is to solve this bug                 if  (typeof  arr ===  "string")  {                     return arr.indexof (Elem);                 }         for  (;  i < len; i++)  {// Skip accessing in  sparse arraysif  (I in arr)  &&  (ARR[i] === elem))  {return i;}}} Return -1;},

jquery1.8, 638 lines to 665 lines, InArray.

IE8: Error: Message: "In" Invalid operand: Object is missing. String cannot use the In keyword iteration under IE8

Solution. Plus a string type of judgment.

Fix bug when IE8; these two lines are intended to resolve this bug if (typeof arr = = = "string") {return Arr.indexof (el                EM); }

bug:jquery1.8.3, "in" operand is invalid: Object is missing