JS从一段英文字符中找出哪个字母最多代码

var str = 'adobe: photoshop, illustrator, fireworks, dreamweaver, flash, phonegap, indesign.',
                        resutl,
                        count = 0;
                var rs = {};
                for (var i = 0, len = str.length; i < len; i++) {
                    var cur = str.charAt(i); //str[i];
                    if (rs[cur]) {
                        rs[cur]++;
                    } else {
                        rs[cur] = 1;
                    }
                }
 
                for (var k in rs) {
                    if (rs[k] > count) {
                        resutl = k;
                        count = rs[k];
                    }
                }
                alert(resutl + '=' + count);

 var str='adobe: photoshop, illustrator, fireworks, dreamweaver, flash, phonegap, indesign.';
    var temp=" ,.:",n = 0, a,s;
    for(var i= 0,l=str.length;i<l;i++){
        a = str.charAt(i);
        if(!~temp.indexOf(a) && str.split(a).length > n){
            s = a;n = str.split(a).length;
            temp +=s;//进一步优化
        }
    }
    alert(s);