Intro

As an example, say you'd like to insert an arrow onto the page + perform a few css modifications.

Pattern

The following pattern can be used to create idempotent JavaScript Values:

var $treatment = $('[data-ascend="arrow"]');

if (!$treatment.length){
    var $arrow = $('<img data-ascend="arrow" src="https://media.ascend.ai/c/263105555-1/buy_arrow_01.png">').css({
        "vertical-align": "middle",
        "margin-left": "0.5em"
    });

    var $em = $("div.btn_buying_wrap a.btn_dshop em");
    $arrow.insertAfter($em);
}
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