javascript 统计字符串中每个字符出现的次数

        var str = "abdcadfasfdbadfafdasdfasyweroweurowqrewqrwqrebwqrewqrejwq;;";

        // console.log(numInstring(str));

        function numInstring(str) {
            var text = "";
            //循环的套出每个字符出现的次数 str会慢慢的变短直到为空
            while (str != "") {
                //先将字符打散
                var newstr = str.split("");
                var count = 0;
                //求得第一个字符出现的次数
                for (var i = 0; i < newstr.length; i++) {
                    if (newstr[0] == newstr[i]) {
                        count++;
                    }
                }
                //在字符串中删掉跟第一个字符一样的所有字符
                var re = new RegExp(newstr[0], "g");
                str = str.replace(re, "");
                text += newstr[0] + ":" + count + "次;";
            }
            return text; //我这里返回的是一段文本 可以自己改写成自己想要的形式
        }

        var str = "adadseffouyangpingfsffffftsdg";
        (function(str) {
            var t = str,
                result = {};
            while (t) { // if this l exists        
                var _st = t.substr(0, 1);
                var m = t.replace(new RegExp(_st, 'gi'), '');
                result[_st] = t.length - m.length;
                t = m;
            }
            var name;
            for (name in result) {
                document.write(name + ":" + result[name] + "  ");
            }
            return result;
        })(str);

        var str1 = "caibaojian.com";
        var arr = str1.split("");
        var obj = {};
        var objArr = [];
        for (var i = 0, j; j = arr[i]; i++) {
            if (!obj[j]) {
                obj[j] = 0;
            }
            objArr[++obj[j]] = j;
        }
        console.info(objArr[objArr.length - 1], objArr.length - 1);