JSON=>字符串 查找字符串中出现频率最高的字母

var json1={
            "name":"yangliu",
            "age":24,
            "sex":"male",
            "firend":{
                "name":"pearl",
                "age":24,
                "sex":"male"
            }
           }
           
           function appearMore(json12){
            var str=JSON.stringify(json12);
            var json2={}
            for(var i=0;i<str.length;i++){
                if(json2[str[i]]){
                    ++json2[str[i]];
                }else{
                    json2[str[i]]=1;
                }
            }
            var count=0;
            var maxkey;
            for (var key in json2) {
                if(json2[key]>count){
                    count=json2[key];
                    maxkey=key;
                }else{
                    continue;
                }
            }
            console.log(maxkey,":",count);
           }
           appearMore(json1);

解析：

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