javascript - 如何使用 Javascript 获取元素为对象的唯一数组

Question

下面是我的一个数组的例子

var mm =  [
    {"id":"Junk","text":"Junk","parent":"#"},
    {"id":"IMG_0245.JPG","text":"IMG_0245.JPG","parent":"Junk"},
    {"id":"Junk","text":"Junk","parent":"#"},
    {"id":"IMG_0246.JPG","text":"IMG_0246.JPG","parent":"Junk"},
    {"id":"Junk","text":"Junk","parent":"#"},
    {"id":"IMG_0247.JPG","text":"IMG_0247.JPG","parent":"Junk"},
    {"id":"Junk","text":"Junk","parent":"#"},
    {"id":"IMG_0248.JPG","text":"IMG_0248.JPG","parent":"Junk"},
    {"id":"Junk","text":"Junk","parent":"#"},
    {"id":"IMG_0249.JPG","text":"IMG_0249.JPG","parent":"Junk"},
    {"id":"Junk","text":"Junk","parent":"#"},
    {"id":"IMG_0250.JPG","text":"IMG_0250.JPG","parent":"Junk"},
    {"id":"Junk","text":"Junk","parent":"#"},
    {"id":"IMG_0251.JPG","text":"IMG_0251.JPG","parent":"Junk"},
    {"id":"Junk","text":"Junk","parent":"#"},
    {"id":"jingling.rar","text":"jingling.rar","parent":"Junk"},
    {"id":"Junk","text":"Junk","parent":"#"},
    {"id":"pics.rar","text":"pics.rar","parent":"Junk"}
];

如果您注意到，数组中的第一个和第三个对象是相同的，依此类推。我查找了内置函数，但找不到。在 jQuery 或 Javascript 中是否有任何简单的内置简单函数来执行此操作？

Answer 1

你可以这样做:

Array.prototype.getUnique = function(){
   var o = {}, a = [];
   for(var i = 0, l = this.length; i < l; ++i){
      if(o.hasOwnProperty(JSON.stringify(this[i]))) {
         continue;
      }
      a.push(this[i]);
      o[JSON.stringify(this[i])] = 1;
   }
   return a;
}

这将返回一个仅包含唯一值的数组。我不认为它有任何内置功能。<​​/p>