火狐，safari,chrome的select以及option適配

匹配火狐下options不顯示問題

<select class="music-select" style="width: 300px;" οnchange="bao(this.options[this.options.selectedIndex].value,this.options.selectedIndex,this.options[this.options.selectedIndex].label)">
</select>

    function init() {
       var sele = document.getElementsByClassName("music-select")[0];
        sele.options[0] = new Option("請選擇音樂");
        sele.options[0].selected = "selected";

        sele.options[1] = new Option("劉德華-冰雨(國)(Live).mp3");
        sele.options[1].value = 0;

        sele.options[2] = new Option("羅大佑-戀曲1990.mp3");
        sele.options[2].value = 1;

        sele.options[3] = new Option("阿木-愛江山更愛美人.mp3");
        sele.options[3].value = 2;

        sele.options[4] = new Option("刀郎-喀什噶爾胡楊 (全新刀郎Demo珍藏版).mp3");
        sele.options[4].value = 3;

    }
  this.onload = init();