javascript计算字符串中每个字符出现次数

function charCount(str) {
  // 用正则匹配将各个字符从字符串中替换掉，直接用正则匹配的match().length获取每个字符出现的次数
  str = str.replace(/s/ig, "");//去除空格
  var strArr = str.split("");
  var result = [],reg;
  for (var i = 0; i < strArr.length; i++) {
   if (str.indexOf(strArr[i]) != -1) {
    reg = new RegExp(strArr[i], "ig");
    counts=str.match(reg).length;
    str = str.replace(reg, "");
    result.push(strArr[i] + ": " + counts);
   } www.111com.net
  }
  return result;
 }
var str="This section of the site is dedicated to the JavaScript language itself, the parts that are not specific to Web pages or other host"
var result=charCount(str);
console.log(result.sort());

function charCount(str) {
  // 用正则匹配将各个字符从字符串中替换掉，替换前字符串长度-替换后字符串长度，差值即为该字符出现的次数！
  str = str.replace(/s/ig, "");//去除空格
  var strArr = str.split("");
  var result = [],beforeLength, afterLength, reg;
  for (var i = 0; i < strArr.length; i++) {
   if (str.indexOf(strArr[i]) != -1) {
    beforeLength = str.length;
    reg = new RegExp(strArr[i], "ig");
    str = str.replace(reg, "");
    afterLength = str.length;
    result.push(strArr[i] + ": " + (beforeLength - afterLength));
   } www.111com.net
  }
  return result;
 }
var str="This section of the site is dedicated to the JavaScript language itself, the parts that are not specific to Web pages or other host"
var result=charCount(str);
console.log(result.sort());