var str = "nininihaoa"; var o = {}; for (var i = 0, length = str.length; i < length; i++) {  var char = str.charAt(i);  if (o[char]) {   o[char]++; //次數(shù)加1  } else {   o[char] = 1; //若第一次出現(xiàn)，次數(shù)記為1  } } console.log(o); //輸出的是完整的對(duì)象，記錄著每一個(gè)字符及其出現(xiàn)的次數(shù) //遍歷對(duì)象，找到出現(xiàn)次數(shù)最多的字符的次數(shù) var max = 0; for (var key in o) {  if (max < o[key]) {   max = o[key]; //max始終儲(chǔ)存次數(shù)最大的那個(gè)  } } for (var key in o) {  if (o[key] == max) {   //console.log(key);   console.log("最多的字符是" + key);   console.log("出現(xiàn)的次數(shù)是" + max);  } } 

entry_name1.indexOf(entry_name)!='-1'

function countInstances(mainStr, subStr)  {    var count = 0;    var offset = 0;    do    {      offset = mainStr.indexOf(subStr, offset);      if(offset != -1)      {        count++;        offset += subStr.length;      }    }while(offset != -1)    return count;  }