如何转换layUI的数据表格中的日期格式

js代码：

layui.use('laytpl', function(){
 var laytpl = layui.laytpl;
 //时间戳的处理
 layui.laytpl.toDateString = function(d, format){
 if(d==null||d==''){
  return "未登录";
 }else{
 var date =new Date(d.time) 
 ,ymd = [
  this.digit(date.getFullYear(), 4)
  ,this.digit(date.getMonth() + 1)
  ,this.digit(date.getDate())
 ]
 ,hms = [
  this.digit(date.getHours())
  ,this.digit(date.getMinutes())
  ,this.digit(date.getSeconds())
 ];
 
 format = format || 'yyyy-MM-dd HH:mm:ss';
 
 return format.replace(/yyyy/g, ymd[0])
 .replace(/MM/g, ymd[1])
 .replace(/dd/g, ymd[2])
 .replace(/HH/g, hms[0])
 .replace(/mm/g, hms[1])
 .replace(/ss/g, hms[2]);
 }
 }
 //数字前置补零
 layui.laytpl.digit = function(num, length, end){
 var str = '';
 num = String(num);
 length = length || 2;
 for(var i = num.length; i < length; i++){
  str += '0';
 }
 return num < Math.pow(10, length) ? str + (num|0) : num;
 };
 });

注意：

1、需引入laytpl模块

2、后台返回json的String类型，否则如果数据为空，会出错，错误如下：

net.sf.json.JSONException: Object is null
 net.sf.json.JSONNull.isEmpty(JSONNull.java:69)
 sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
 sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
 sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
 java.lang.reflect.Method.invoke(Method.java:606)
 com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:536)
 com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:663)
 com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:156)
 com.fasterxml.jackson.databind.ser.std.MapSerializer.serializeFields(MapSerializer.java:557)
 com.fasterxml.jackson.databind.ser.std.MapSerializer.serialize(MapSerializer.java:466)
 com.fasterxml.jackson.databind.ser.std.MapSerializer.serialize(MapSerializer.java:29)
 com.fasterxml.jackson.databind.ser.std.CollectionSerializer.serializeContents(CollectionSerializer.java:132)
 com.fasterxml.jackson.databind.ser.std.CollectionSerializer.serialize(CollectionSerializer.java:94)
 com.fasterxml.jackson.databind.ser.std.CollectionSerializer.serialize(CollectionSerializer.java:24)
 com.fasterxml.jackson.databind.ser.std.MapSerializer.serializeFields(MapSerializer.java:557)
 com.fasterxml.jackson.databind.ser.std.MapSerializer.serialize(MapSerializer.java:466)
 com.fasterxml.jackson.databind.ser.std.MapSerializer.serialize(MapSerializer.java:29)
 com.fasterxml.jackson.databind.ser.DefaultSerializerProvider.serializeValue(DefaultSerializerProvider.java:251)
 com.fasterxml.jackson.databind.ObjectWriter.writeValue(ObjectWriter.java:846)
 org.springframework.http.converter.json.AbstractJackson2HttpMessageConverter.writeInternal(AbstractJackson2HttpMessageConverter.java:286)
 org.springframework.http.converter.AbstractGenericHttpMessageConverter.write(AbstractGenericHttpMessageConverter.java:106)
 org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodProcessor.writeWithMessageConverters(AbstractMessageConverterMethodProcessor.java:231)
 org.springframework.web.servlet.mvc.method.annotation.RequestResponseBodyMethodProcessor.handleReturnValue(RequestResponseBodyMethodProcessor.java:174)
 org.springframework.web.method.support.HandlerMethodReturnValueHandlerComposite.handleReturnValue(HandlerMethodReturnValueHandlerComposite.java:81)
 org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:113)
 org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:827)
 org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:738)
 org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85)
 org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:967)
 org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:901)
 org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970)
 org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:861)
 javax.servlet.http.HttpServlet.service(HttpServlet.java:624)
 org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846)
 javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
 org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
 org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:197)
 org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)

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