Java前端Layer.open.btn验证无效解决方法

var index = layer.open({
          type: 2,
          area: [width + 'px', height + 'px'],
          fix: false,
          //不固定
          maxmin: true,
          shade: 0.3,
          title: title,
          content: url,
          btn: ['保存', '提交', '取消'],
          yes: function(index, layero) {
            var iframeWin = layero.find('iframe')[0];
             iframeWin.contentWindow.submitHandler(0);
          },
          btn2: function(index, layero) {
            var iframeWin = layero.find('iframe')[0];
             iframeWin.contentWindow.submitHandler(1);
             return false; //就是这里好扑街！记得加上return false!!!!
          },
          btn3: function(index, layero) {
             return true;
          },
          cancel: function(index) {
            return true;
          },