当前位置 主页 > 网站技术 > 代码类 >

    JS中数组实现代码(倒序遍历数组,数组连接字符串)

    栏目:代码类 时间:2019-12-29 12:08

    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>