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卢浩良
Original
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<!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>

      let arr = [1, 9, 3, 4, 5]

      //reduce  进行累加

      let res4 = arr.reduce((acc, item, index, arr) => acc + item)

      console.log(res4)

      //遍历数组

      let res = arr.forEach(function (item, index, arr) {

        console.log(item, index, arr)

      })

      console.log(res)

      //进行降序排列

      let res1 = arr.sort(function (a, b) {

        return b - a

      })

      console.log(res1)

      //取数

      let res2 = arr.slice(2, 5)

      console.log(res2)

      //splice 进行删除

      //console.log(arr)

      let res3 = arr.splice(1, 2)

      console.log(arr)

      console.log(arr.splice(1, 0, 'red', 'green'))

      console.log(arr)

    </script>

  </body>

</html>



Correction status:Uncorrected

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