用Javascript将数组["a","b","a",1,"d","b",1,"c",2,"e","d"] 重复的元素 后面 加上 编号

回答:要用Javascript将数组["a","b","a",1,"d","b",1,"c",2,"e","d"]中重复的元素后面加上编号，可以使用以下代码实现：

function addIndexToDuplicates(arr) {
  var count = {};
  var newArr = [];

  for (var i = 0; i < arr.length; i++) {
    var item = arr[i];
    if (count[item === undefined) {
      count[item = 1;
    } else {
      count[item]++;
      item += count[item];
    }
    newArr.push(item);
  }
  
  return newArr;
}

var demo = addIndexToDuplicates(["a","b","a",1,"d","b",1,"c",2,"e","d"]);
console.log(demo);

这段代码会遍历数组中的每个元素，使用一个计数器对象`count`来记录每个元素出现的次数。如果一个元素在计数器对象中不存在，则将其计数设为1。如果一个元素在计数器对象中已经存在，则将其计数加1，并在元素后面添加该计数。最后，将处理后的元素依次添加到新数组`newArr`中，并将新数组返回。运行这段代码，你将得到["a","b","a1",1,"d","b1",2,"c",2,"e","d2"]作为结果。<em>1</em><em>2</em><em>3</em>
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