JSFiddle - React, Tailwind, and code Playground
JavaScript
var REPLACE_HTML_STRING = '<a href="http://www.yahoo.co.jp/rd?ep=dxEMLiBN4hiGyDX1UOEn_hrxo.0GUUMlOR4RIrAaFEN…1&r=10&rfm=2&sfid=107531&skwid=0&tlid=0&u=_OTHER_&yads_ds=31531_107587&v=2" target="_top" style="opacity:1; background-image:url("{img_src}");">http://www.yahoo.co.jp/rd?ep=dxEMLiBN4hiGyDX1UOEn_hrxo.0GUUMlOR4RIrAaFEN…1&r=10&rfm=2&sfid=107531&skwid=0&tlid=0&u=_OTHER_&yads_ds=31531_107587&v=2" target="_top" style="opacity:1; background-image:url("{img_src}");</a>';
var reg = new RegExp('{img_src}', 'g');
var temp_html = '';
var img_src = '//element_1/element_2/test.png';
temp_html = REPLACE_HTML_STRING.replace( reg, img_src);
console.log(temp_html);
document.getElementById( 'tg' ).innerHTML = temp_html;//innerText