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javaScript
/
test.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>
  <style></style>
</head>

<body>
</body>
<script>
  let obj = { a: 5, b: 8, c: 4, d: 6 };

  var arr = []
  for (let i in obj) {
    arr.push(obj[i]); //属性
    //arr.push(obj[i]); //值
  }
  console.log(arr);

  let data = {}
  for (let i in obj) {
    data[i] = [obj[i]]
  }
  console.log(data);

  let a = undefined;

  let b = localStorage.getItem('a') || ''

  console.log(111, b);


  let i = 10;
  for (i--; i >= 0; i--) {
    console.log(i);

  }

</script>


</html>