JSFiddle - React, Tailwind, and code Playground
HTML
<span class="pv-text pv_value_span">3.9</span>
<span class="star"></span>
JavaScript
var number = $('.pv-text.pv_value_span').html();
var number_1 = parseInt(number);
var number_2 = number_1.toFixed();
if(number_2 == 3 ){
$('.star').html('<i>a</i>')
}
var after_int = (number_1 +' ').split(".")[1].substr(0,1);
alert(after_int);
alert(number_1);