一.案例代码：
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>内置对象扩展</title>
</head>
<body>
<script type="text/javascript" src="js/jquery.js" ></script>
<script>
//1.模板字符串
let html_1='<html><head></head><body><p>今天天气很好！</p><div>适合敲代码</div></body></html>';
console.log(html_1);
let str_1='今天天气很好！';
let str_2='适合敲代码';
let className='test';
let html_2=`
<html>
<head></head>
<body>
<p>${str_1}</p>
<div class="${className}">${str_2}</div>
</body>
</html>
`;
console.log(html_2);
</script>
</body>
</html>二.结果：
