ES2020合并空运算符 

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  
</body>
<script>
  function test(name, age) {
    name = name ?? "张三";
    age = age ?? 20;
    console.log(name, age);
  }
  test("", 0);
</script>
</html>

 

posted @ 2021-02-15 14:01  starlog  阅读(33)  评论(0)  编辑  收藏  举报