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  • js学习笔记之:数组(二)

       今天来学习一下数组的遍历、删除等知识点:

       1 数组的遍历

          数组元素的遍历可以使用for循环,采用关键字for...in

           var aCity =  new Array("北京","上海","广州");     //声明一个数组

           for(var i in aCity){                                         //遍历数组中的每一项

                 alert(aCity[i]);   

          }

       

        二维数组的遍历:

         var aCity = new Array();

         aCity[0] = new Array();   //二维数组赋值

         aCity[0][0] = "常州";

         aCity[0][1] = "苏州";

         aCity[1] = new Array();

         aCity[1][0] = "泰州";

         aCity[1][1] = "镇江";

         aCity[2] = new Array();

         aCity[2][0] = "徐州";

         aCity[2][1] = "连云港";

         for(var i in  aCity){         //遍历二维数组

            for(var j in aCity[i])

                alert(aCity[i][j]);

         }

           

       2 删除元素

          删除元素可以使用函数pop()和shift(),pop是从数组尾部开始删除、shift是从数组头部开始删除;

          var aCity = new Array("东台","南京","上海");   
          aCity.pop();                //删除“上海”
          aCity.shift();              //删除“东台”

         

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  • 原文地址:https://www.cnblogs.com/njcolin/p/3513851.html
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