星级评分在json文件中是用wm_poi_score表示，为什么用score也行score在json文件中找不到

(function(){

    // 得分模版字符串
    var itemTmpl = '<div class="star-score">$starstr</div>';


    function _getStars(){

        var _score = this.score.toString();

        //4.4
        var scoreArray = _score.split('.');


        // 满星
        var fullstar = parseInt(scoreArray[0]);

        // 半星
        var halfstar = parseInt(scoreArray[1]) >=5 ? 1: 0;

        // 0星
        var nullstar = 5 - fullstar - halfstar;

        var starstr = '';

        for (var i = 0 ; i < fullstar ; i++) {
            starstr += '<div class="star fullstar"></div>'
        }

        for (var j = 0 ; j < halfstar ; j++) {
            starstr += '<div class="star halfstar"></div>'
        }


        for (var k = 0 ; k < nullstar ; k++) {
            starstr += '<div class="star nullstar"></div>'
        }


        return itemTmpl.replace('$starstr',starstr);

    }

    window.StarScore = function(score){
        this.score = score || '';

        this.getStars = _getStars;
    }

})();