layui自定义验证,用ajax查询后台是否有重复数据,form.verify的例子

form.verify({  account: function(value, item){ //value：表单的值、item：表单的DOM对象  if(value.trim() == ""){   return '账号不能为空';  }  var param = { employeeId: $("#hidEmployeeId").val(), employeeAccount: $("#employeeAccount").val() } var checkResult = "";  $.ajax({ url: "../../selectEmpIdByAccount", type: "GET", data: param, async: false, success: function(result) {  if(result.extend.isRepeat){   checkResult = "该账号已存在";  } }, error: function() { } }); return checkResult;  } });