//初始化地图
    var map = new AMap.Map('container', {
      resizeEnable: true,
      center: [121.498586, 31.239637],
      lang: "en" //可选值：en，zh_en, zh_cn
    });

    //绑定radio点击事件
    var radios = document.querySelectorAll("#lang input");
    radios.forEach(function(ratio) {
      ratio.onclick = setLang;
    });

    function setLang() {
      map.setLang(this.id);
    }

done!