<div class="div1"></div>

    <script type="text/javascript">

        let person = {

            name: "xiaoming",

            age: 18

        }

        let elem = document.querySelector('.div1')

        elem.innerHTML = "He is <b>" + person.name + " </b> " + "and we wish to know his" + person.age + ".That is all<br>"

       const info=`He is <b>`;${person.name} ;`and we wish to know his`;${ person.age};`.That is all<br>