Layui Switch 开关监听事件实现方法

 <input type="checkbox" name="zzz" lay-skin="switch" lay-filter="switchTest" lay-text="开启|关闭" checked="checked">//开关
 //js处理
 layui.use(['form', 'jquery', 'layer'], function () {
      var form = layui.form;
      var jquery = layui.jquery;
      var layer = layui.layer;
      //监听开关事件
      form.on('switch(switchTest)', function (data) {
        var contexts;
        var x = data.elem.checked;//判断开关状态
        if (x==true) {
          contexts = "你确定要启动么";
        } else {
          contexts = "你确定要关闭么";
        }
        layer.open({
          content: contexts
          , btn: ['确定', '取消']
          , yes: function (index, layero) {
            data.elem.checked = x;
            form.render();
            layer.close(index);
            //按钮【按钮一】的回调
          }
          , btn2: function (index, layero) {
            //按钮【按钮二】的回调
            data.elem.checked = !x;
            form.render();
            layer.close(index);
            //return false 开启该代码可禁止点击该按钮关闭
          }
          , cancel: function () {
            //右上角关闭回调
            data.elem.checked = !x;
            form.render();
            //return false 开启该代码可禁止点击该按钮关闭
          }
        });
        return false;
      });
    });