json

echo json_encode返回的json编码的字符串类型

post( url [, data ] [, success ] [, dataType ] )

• • url
    Type:  String
    A string containing the URL to which the request is sent.
  • data
    Type:  PlainObject or  String
    A plain object or string that is sent to the server with the request.
  • success
    Type:  Function(  Object data,  String textStatus,  jqXHR jqXHR )
    A callback function that is executed if the request succeeds. Required if  dataType is provided, but can be  null in that case.
  • dataType
    Type:  String
    The type of data expected from the server. Default: Intelligent Guess (xml, json, script, text, html).
  • 
    

jquery post会自动判断类型 echo json_encode($xxx) 输出的是字符串

所以需要 

parseJSON( json )

去解析

Description: Takes a well-formed JSON string and returns the resulting JavaScript value.

parsejson是解析json格式的字符串

 

至于 tpp的ajaxreturn则直接返回的是json形式的数据而不是json一样的字符串

所以不需要parseJSON去解析

post知道它是json就会按照json格式处理

ajaxreturn的前端

$.post('/newinfo/index.php/Index/login',$(this).serialize(),function(data){
if(data.flag==0){
window.location.href='/newinfo/index.php/MainPage/index';
}else if(data.flag==1){
alert('E-mail address does not exist!');
}else{
alert('Email address and password do not match！');
}
},"json");

json_encode的前端

$.post('php/user_mgr.php',$(this).serialize(),function(data){
if($.parseJSON(data).flag==0){
window.location.href='ir_main.php';
}else if($.parseJSON(data).flag==1){
alert('E-mail address does not exist!');
}else{
alert('Email address and password do not match！');
}
});