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给定一个数组:['abc','deksa','fwdksw','skradkfa', ...]
求数组里出现次数最多的字。
<script type="text/javascript">
Array.prototype.search = function (){
  var obj = {}
  for(var i = 0, len = this.length; i < len; i ++){
    var str = this[i]
  	for(var j = 0, leng = str.length; j < leng; j ++){
      if(str[j] in obj){
        obj[str[j]] ++
      } else {
        obj[str[j]] = 1
      }
  	}
  }
  var num = 0
  var ret
  for(var key in obj){
    if(obj[key] > num){
      num = obj[key]
      ret = key
    }
  }
  return {
    'obj' : obj,
    'word: ' : ret,
    'num: ' : num
  }
}

var arr = ['aaa','bbbb','cccaa','dakerjg','aerivja','frejsdiru','fjaerig','aeigkfdhr','fasdjhrivg','eukafgt','afje5igh']
console.log(arr.search())
</script>


<script type="text/javascript">
Array.prototype.duplicate = function(){
  return this.concat(this)
}
</script>
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