Easy way to invite all friends to  "Like Page"  at once
Follow below steps:-
1.Open Google chrome Web Browser.
2.Open your Facebook account.
3.after log in Facebook account open "NEW TAB".
4.Now open your page which you invite your friends
Eg. https://www.facebook.com/Atinythings
5.Now you see right corner Build Audience >> Invite friends.

6.You open a window after click on invite friends.

7.Scroll till you can't see your all friends request.
7.Now on keyboard click on "Ctrl+Shift+J"
8.Now you see a Console window.
9.Paste below code in the console window.


javascript:var inputs = document.getElementsByClassName('uiButton _1sm');for(var i=0; i<inputs.length; i++) { inputs[i].click(); }