模板字符串
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
</head>
<body>
<script type="text/javascript">
var name ="小王";
var age = 18;
// var str = "姓名:"+name+"年龄"+age;
var str = `姓名：${name}, 年龄：${age}`;
console.log(str)
</script>
</body>
</html>
