JavaScript increasing variable

Question

I want to add ID to each element of class .content, and I want each ID to have integer increase by 1. Example:

Answer 1

Use this operator

    var number = 1;
$(".content").each(function() { 
    $('.content').attr('id', 'content_' + number);
    number++;
});

or

var length = $(".content").length;

for(i=1;i