Shortest ie Determination

In the past, the shortest ie determination was developed by virtue of the feature that IE does not support vertical tabs.

Code:

VaR Ie =! + "\ V1 ";

Only 7 bytes! See this articleArticle, 32 bytes, ehr... 9, ehr... 7 !!! To know if your browser is IE, describes how foreigners reduce IE's judgment from 32 bytes to 7 bytes step by step! Story

But this record was broken by a Russian in January 8 this year, and now it only takes 6 bytes! It makes use of the difference between IE and the standard browser in handling the tostring method of arrays. For the standard browser, if the last character in the array is a comma, The JS engine will automatically remove it.

Code:

VaR Ie =! -[1,];
VaR Ie =! -[1,];
Alert (IE );

If we judge from the Perspective of Non-ie, we can save a bit, because when we are compatible, most of the cases are IE and non-ie.

Code:

VaR notie =-[1,];
 
If (-[1,]) {
Alert ("this is not an Internet Explorer! ");
} Else {
Alert ("this is IE browser! ");
}