red 颜色无法显示，div.style.color = 'red'此行代码出现报错
<script src="https://www.imooc.com/static/lib/jquery/1.9.1/jquery.js"></script>
<script>
let $div = $('div');
let div = $div[0];
div.style.color = 'red';
</script>
<div>元素一</div>
<div>元素二</div>
<div>元素三</div>
