function arrayDuplicateRemove(arr){
    var c = 0;
    var tempArray = [];
    console.log(arr);
    arr.sort();
    console.log(arr);
    for (var i = arr.length - 1; i >= 0; i--) {
        if(arr[i] != tempArray[c-1]){
            tempArray.push(arr[i])
            c++;
        }
    };
    console.log(tempArray);
    tempArray.sort();
    console.log(tempArray);
}

var uniqueCompnies = function(companyArray) {
    var arrayUniqueCompnies = [],
        found, x, y;

    for (x = 0; x < companyArray.length; x++) {
        found = undefined;
        for (y = 0; y < arrayUniqueCompnies.length; y++) {
            if (companyArray[x] === arrayUniqueCompnies[y]) {
                found = true;
                break;
            }
        }

        if ( ! found) {
            arrayUniqueCompnies.push(companyArray[x]);
        }
    }

    return arrayUniqueCompnies;
}

var arr = [
    "Adobe Systems Incorporated",
    "IBX",
    "IBX",
    "BlackRock, Inc.",
    "BlackRock, Inc.",
];

您只需在JavaScript中使用filter方法的第二个-index参数即可：

var a = [2,3,4,5,5,4];
a.filter(function(value, index){ return a.indexOf(value) == index });

或在短手

a.filter((v,i) => a.indexOf(v) == i)

像这样使用Array.filter（）

var actualArr=[苹果'，苹果'，香蕉'，芒果'，草莓'，香蕉]；console.log（'实际数组：'+actualArr）；var filteredArr=actualArr.filter（函数（项，索引）{if（actualArr.indexOf（item）==索引）退货项目；});console.log（'FilteredArray:'+filtedArr）；

这可以在ES6中缩短到

actualArr.filter((item,index,self) => self.indexOf(item)==index);

下面是Array.filter（）的详细解释

删除字符串重复项的最简单方法是使用关联数组，然后遍历关联数组以使列表/数组返回。

如下所示：

var toHash = [];
var toList = [];

// add from ur data list to hash
$(data.pointsToList).each(function(index, Element) {
    toHash[Element.nameTo]= Element.nameTo;
});

// now convert hash to array
// don't forget the "hasownproperty" else u will get random results 
for (var key in toHash)  {
    if (toHash.hasOwnProperty(key)) { 
      toList.push(toHash[key]);
   }
}

瞧，现在复制品不见了！

这里非常简单，可以在任何地方（甚至在PhotoshopScript中）理解和工作代码。检查一下！

var peoplenames = new Array("Mike","Matt","Nancy","Adam","Jenny","Nancy","Carl");

peoplenames = unique(peoplenames);
alert(peoplenames);

function unique(array){
    var len = array.length;
    for(var i = 0; i < len; i++) for(var j = i + 1; j < len; j++) 
        if(array[j] == array[i]){
            array.splice(j,1);
            j--;
            len--;
        }
    return array;
}

//*result* peoplenames == ["Mike","Matt","Nancy","Adam","Jenny","Carl"]