网页爬虫 - python爬虫爬取携程网的酒店评论数据时，有个请求参数不知道是怎么生成的？

Question

比如这个酒店：http://hotels.ctrip.com/hotel/dianping/1943326.html
酒店的点评数据是通过ajax方式异步加载的，不想用模拟浏览器的方式来爬，太慢了，想直接请求点评数据的地址，但是这个eleven参数不知道是怎么生成的，在网页源码中没找到，分析js代码也没看出个所以然来，请大神来分析下，多谢了

Answer 1

This is indeed a bit perverted, but you can simulate mobile phone access (change user agent). You can get comment data, which is static html.
http://m.ctrip.com/html5/hotel/HotelDetail/dianping/1943326.html
Look at the request carefully, there is a compressed js that is calculating parameters, it gives me a headache.

Answer 2

Don’t worry about how it is generated, be more violent, bring all the headers, and all the parameters are the same, it must be OK

Answer 3

It looks like it may be base64 encoded or encrypted. Related to other parameters, it is suspected that it is a signature parameter to prevent grabbing.

Answer 4

is generated by the following code, which I can’t understand:
,_getElevenValue:function(e){

function o(e){
    for(var o=["A","B","C","D","E","F","G","H","I","J","K","L","M","N","O","P","Q","R","S","T","U","V","W","X","Y","Z"],n="",t=0;e>t;t++){
        var i=Math.ceil(25*Math.random());
        n+=o[i]
    }
    return n
}
    
var n,t=o(7),i=!1;
if(!hotelDomesticConfig.cas.OceanBall)return e.resolve("");
for(;window[t];)
  t=o(15);
n=hotelDomesticConfig.cas.OceanBallUrl+"?callback="+t+"&_="+(new Date).getTime()
 ,window[t]=function(o){
                   window[t]=void 0;
                   var n="";
                   try{n=o()}
                   catch(a){$.ajax("/domestic/cas/image/bi"
                       ,{method:$.AJAX_METHOD_POST,cache:!1,context:{value:"11-"+encodeURIComponent(a.stack||a)}})
                   }
                   finally{i=!0,e.resolve(n)}
 }
 ,$.loader.js(n,{onload:function(){i||(window[t]=void 0,e.reject(""))},onerror:function(o){o&&(window[t]=void 0),e.reject("")}})

}