js获取汉字声母

getShengmu.js

var getShengmu = (function () {
    var idx = -1;
    var MAP = 'ABCDEFGHJKLMNOPQRSTWXYZ';
    var boundaryChar = '驁簿錯鵽樲鰒餜靃攟鬠纙鞪黁漚曝裠鶸蜶籜鶩鑂韻糳';

    if ( !String.prototype.localeCompare ) {
        throw Error('String.prototype.localeCompare not supported.');
    }

    return function getShengmu(c) {
        if ( /[^\u4e00-\u9fa5]/.test(c) ) {
            return c;
        }
        for (var i = 0; i < boundaryChar.length; i++) {
            if (boundaryChar[i].localeCompare( c, 'zh-CN-u-co-pinyin' ) >= 0) {
                idx = i;
                break;
            }
        }
        return MAP[idx];
    };
}());