javascript數組去重

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function unique(arr) {  var result = [], hash = {};      for (var i = 0, elem; (elem = arr[i]) != null; i++) {//迴圈arr數組          if (!hash[elem]) {//hash數組作用：判斷當前元素是否存在              result.push(elem);//不存在：將當前元素存入到result數組中              hash[elem] = true;//設定當前元素存在              }          }          console.log(JSON.stringify(hash,null,2));//{"f": true,"a": true,"b": true,"c": true,"d": true,"e": true}          return result;//返回去重後元素        } var arr = ["f","a","b","c","a","a","b","d","e","e","f"]; var result = unique(arr); console.log(result);//["f", "a", "b", "c", "d", "e"]

 

javascript數組去重