JQuery Fügen Sie die Nummer als ID -Variable hinzu

You need to add parenthesis () for priority to evaluate add loopVar first. If your variable contains numeric value then do not need to apply parseInt function.

loopVar = "1";
alert('#imgAvatar'+(parseInt(loopVar)+1));

OR

loopVar = 1;
alert('#imgAvatar'+ (loopVar+1) );
Splendid Salmon