js根据需要计算数组中重复出现某个元素的个数

var arr = ["apple","orange","apple","orange","pear","orange"];

  //统计一个数组中有多少个不重复的单词：  // 不用reduce时：   var arr = ["apple","orange","apple","orange","pear","orange"];   function getWordCnt(){     var obj = {};     for(var i= 0, l = arr.length; i< l; i++){       var item = arr[i];       obj[item] = (obj[item] +1 ) || 1;     }     return obj;   }  console.log(getWordCnt());//{apple: 2, orange: 3, pear: 1}  // 用reduce时：   var arr = ["apple","orange","apple","orange","pear","orange"];   function getWordCnt(){     return arr.reduce(function(prev,next){       prev[next] = (prev[next] + 1) || 1;       return prev;     },{});   }   console.log(getWordCnt());//{apple: 2, orange: 3, pear: 1}

  var muziObj = {};  muziObj['name'] = 'muzidigbig';  muziObj.age = 21;  console.log(muziObj)//{name: "muzidigbig", age: 21}