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class87-front-end-code
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es6-bianliangtisheng.html

<!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>
<script>
  // console.log(a);
  // let a = '87'
  console.log(b);
  var b = '86'
</script>
</body>
</html>