Javascript 从多个字符串中只保留一个字符串-数组

我只需要从数组中保留一个字符串：

var string = "dog";

var array = ["dog","cat","bird","snake","tiger","dog", "dog", "cat"];

好吧，这看起来很愚蠢，为什么我写了多次“狗”，但这只是一个例子

实际上，它将从输入标记生成一个数组。像这样：

  firstEntry = true;

  inputValue = inputfield.value;

  if(inputValue != ''){
      if(firstEntry){
      inputArray.push(inputValue);
      firstEntry = false;
  }

//And know it should leave only one String

  inputValueSplit = inputValue.split(/ /g);
  removeFromArray(inputValueSplit,'');//This is a external function, (deletes empty Strings)
  inputArray = inputValueSplit;


  inputArray.filter(inputValue); // Here it should leave only one 
                                 // String of multiple Strings from
                                 // same value.

---

我在这里或谷歌上没有找到任何东西。

不知道你的意思。如果需要只包含初始数组中的“dog”值的数组，可以使用

array.filter

：

var dogs = ["dog","cat","bird","snake","tiger","dog", "dog", "cat"]
            .filter( function(a){ return a == this; }, 'dog' );
//=> ['dog','dog','dog']

如果要从初始数组中删除双“dog”值：

var singleout = 'dog'
   ,dogs = (["dog","cat","bird","snake","tiger","dog", "dog", "cat"]
            .filter( function(a){ return a != this }, singleout ));
// now dogs contains no 'dog' value, so add 'dog' to it again
dogs.push(singleout);
//=> ["cat", "bird", "snake", "tiger", "cat", "dog"]

不使用

过滤器

，这是一种从数组中删除双值的通用方法：

function noDoubles(arr) {
  var doubleChk = {}, noDoubles = []; 
  for (var i=0;i<arr.length;i+=1) { doubleChk[arr[i]] = true; }
  for (var l in doubleChk) { noDoubles.push(l); }
  return noDoubles;
}
noDoubles(["dog","cat","bird","snake","tiger","dog", "dog", "cat"]);
//=> ["dog", "cat", "bird", "snake", "tiger"]

有关

Array.filter

方法，请参阅。链接页面还包含一个垫片，用于在旧浏览器中启用该方法。

您可以使用自定义函数；如果在筛选之前找到特定值，则从那时起：

var string = "dog";
var array = ["dog","cat","bird","snake","tiger","dog", "dog", "cat"];

var result = (function() {
    var found = false;

    // @see: https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Array/filter
    return array.filter(function(value) {
        if (value == string) {
            // only allow this one time
            return found ? false : found = true;
        }
        return true;
    });
}());

---

我想如果我有：

array = ["dog","cat","bird","snake","tiger","dog", "dog", "cat"]

我希望我能：

array = ["dog","cat","bird","snake","tiger"]

感谢您的noDouble-功能

---

这是我所需要的完美方式。

不清楚你想要实现什么。你只是想过滤掉数组，这样就只剩下你要查找的单个值了吗？我在这里或Google中没有找到任何东西如果我理解正确，请尝试重新表述问题，以更清楚地说明您在寻找什么。基本上，如果某个特定值出现N次，您希望最多保留一次？

array = ["dog","cat","bird","snake","tiger"]