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      首頁 > 網站開發 > JavaScript >
      • JavaScript教程之數組去重

      • 2019-04-17 20:28 來源:未知

      數組的去重,

      首先聲明一個舊數組
      var arrOld = [1,2,3,4,5,6,7,8,9,8,7,6,5,4,3,2,1];
      可見舊數組中有許多重復的元素,那么我們來清除這些重復的元素
      聲明一個新數組
      var arrNew = [];
      接下來我們在新數組中放入一個舊數組中的元素
      因為在新數組中 只有一個元素是不可能重復的
      var arrNew = [arrOld[0]];
      然后我們用for循環來遍歷舊數組,假設舊數組中的所有元素都能放進新數組
      for(var i= ;i
      這里為什么i=1呢,因為我們之前已經把第0位數放到新數組中去了
             var flag = ="true";
      };
      我們還需要把舊數組和新數組作對比,兩個數組里面有一個相等的就不把它放進新數組中
      for(var j=0;j
             這里用if來判斷
             if(arrOld[i] == arrNew[j]{
                       flag = false;
                       break;
                       打斷這次判斷,
             }
              if(flag){
                     如果flag還是true,那就代表這個老數組不存在新數組中,
                    arrNew[arrNew.length] = arrOld[i];
              }
      }
      最后在控制臺打印出來
      console.log(arrNew);
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