用数组生成dom用数组生成dom。let iconBg = ["","","&#xE04

html:
<div class="iconsBg" id="iconsBg">
   <!-- <span class="material-icons active">&#xE021;</span>
   <span class="material-icons">&#xE030;</span>
   <span class="material-icons">&#xE048;</span> -->
</div>

js：
let iconBg = ["&#xE021;","&#xE030;","&#xE048;"];
let html = iconBg.map((v) => {
  return (`<span class="material-icons">${v}</span>`)
}).join('');
$('iconsBg').innerHTML = html;