一、模板字符串
1. 模板字符串 : 简化字符串的拼接 * 模板字符串必须用 `` 包含 * 变化的部分使用${xxx}定义
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>04_模板字符串</title>
</head>
<body>
<script type="text/javascript">
let obj = {
username:'onedean',
age:20
}
let str = 'my name is ' + obj.username + ' and i am ' + obj.age + 'years old this year'
console.log(str)
str = `my name is ${obj.username} and i am ${obj.age} years old this year`
console.log(str)
</script>
</body>
</html>