Introduction to the bug when jQuery uses unclosed xml code to create elements under IE_jquery

First initialize the two variables, please pay attention to the subtle differences:

Copy the code The code is as follows:

var a=$('');
var b=$('');
// cannot be used alone $(''), because jQuery has optimized it

Copy code Code As follows:

typeof a[0]; // 'object'
typeof b[0]; // 'object'

IE(6|7 |Performance under 8):

Copy code The code is as follows:

typeof a[0] ; // 'undefined'
typeof b[0]; // 'object'

It should be noted that under IE(6|7|8), a is only missing than b [0] is an object member.
I have submitted this bug to the official. Before getting the fix, I’d better add the backslash honestly.