JS中数组实现代码(倒序遍历数组,数组连接字符串)

Js中的数组是一种特殊的对象,用来表示偏移量的索引是该对象的属性。

具体代码如下所示:

// =================== 求最大值=====================================

<script>

  var arr = [10,35,765,21345,678,89];

  var max = arr [0];

  for (var i=0;i< arr.length;i++) {

    if (max<arr[i]){

      max = arr [i];

    }

  }

  console.log("最大值:" + max);

</script>

// =================== 求最小值=====================================

<script>

  var arr = [10,35,765,21345,678,89];

  var max = arr [0];

  for (var i=0;i< arr.length;i++) {

    if (max>arr[i]){

      max = arr [i];

    }

  }

  console.log("最小值:" + max);

</script>

// ============================倒序遍历数组===============================

<script>

  var arr = [1,2,3,4,5,6,7,8,9];

  for (var i= arr.length-1;i>=0;i--){

    console.log(arr[i]);

  }

</script>

//===========数组拼接字符串===========第一种方法(从前面往后加)=========

<script>

  var names = ["周杰伦","李连杰","林俊杰","张韶涵","田馥甄"];

  var str = "";

    for (var i = 0; i< names.length-1;i++){

      str += names[i] + "|"

    }

    console.log(str+ names[names.length-1]);

</script>

//===========数组拼接字符串===========第二种方法(从后面往前加)=========

<script>

  var names = ["周杰伦","李连杰","林俊杰","张韶涵","田馥甄"];

  var str = "";

  for (var i = 1; i< names.length;i++){

    str += "|" + names[i]

  }

  console.log(names[0]+ str);

</script>

// ==============去掉数组中重复的0,把其他的数据放在一个数组中============

<script>

  var arr = [10,20,0,12,0,0,124,32];

  var newArr = [];

  for (var i=0; i<arr.length; i++){

    if (arr[i] != 0){

    newArr[newArr.length] = arr[i];

    }

  }

  console.log(newArr);

</script>

// =====================反转数组----------把数组中的数据位置调换=============

<script>

  var array = [10,20,30,40,50,60];

  for (var i=0 ;i<=array.length/2;i++){

    var temp = array [i];

    array[i] = array[array.length-1-i];

    array[array.length-1-i] = temp;

  }

  console.log(array);

</script>

//===========数列求成绩,总成绩,平均分,最大最小值===============//

<script>

  var proInput = parseInt(prompt("请输入计研17的班级人数"));

  var proScore = [];

  for (var i = 0; i< proInput; i++){

    proScore[proScore.length] = parseInt(prompt("请输入第"+ (i+1) + "个同学的成绩"));

  }

  console.log(proScore);

  var sum =0;

  var aver = 0;

  var max = proScore[0];

  var min = proScore[0];

  for (var i = 0;i< proScore.length;i++){

    sum += proScore[i];

    aver = sum/proScore.length;

    if (max<proScore[i]){

      max = proScore[i];

    }

    if (min>proScore[i]){

      min = proScore[i];

    }

  }

  console.log("班级总成绩:"+ sum);

  console.log("平均值:"+ aver);

  console.log("最大值:"+ max);

  console.log("最小值:"+ min);

</script>

总结

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