JavaScript

超轻量级php框架startmvc

JS中数组实现代码(倒序遍历数组,数组连接字符串)

更新时间:2020-09-28 10:36:01 作者:startmvc
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

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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