模板字符串:使用tab键上面的反引号``,插入变量时使用${变量名}
<div class="box">
</div>
<script>
const oBox = document.querySelector('.box');
let id = 1,name = 'tom';
//原js写法,字符串拼接
oBox.innerHTML = "<ul><li><p id=" + id + ">" + name + "</p></li></ul>";
//es6写法,模板字符串
let htmlStr = `<ul>
<li>
<p id=${id}>${name}</p>
</li>
</ul>`;
oBox.innerHTML = htmlStr;
</script>