web自动化测试学习以及Javascript学习（四）

    这次原计划写些关于sahi的页面监视的内容，本来我的文章都在百度空间里，现在毕业了，就都搬过来了，前三篇baidu空间wcf1987都有。由于已经毕业了，东西遗失了一些，我就拿我论文中我自己仿造sahi实现的部分讲讲吧。注意：我的原理与sahi基本上一致（其实借鉴了很多。。。），但是sahi考虑了很多，特别是JavaScript在包括了ie与ff的不同，我就只专注了ie。

 

事件驱动模型的三大要素：事件源：能够接收外部事件的源体。侦听器：能够接收事件源通知的对象。事件处理程序：用于处理事件的对象。若要实现事件监听模块，需要给事件源注册侦听器。通常采用的方法是遍历页面上元素分别按照其类型注册侦听器。这种方法有个缺点：当页面元素很多时，如新浪网站有很多信息。这样页面加载时候就要一一为每个元素注册侦听器，会有所延迟。

在这里选择了一种巧妙的思路：考虑用户并不一定会浏览所有的信息，通常情况下是不会的。所以利用JavaScript里的注册侦听器方法，先给页面注册一个mouseover事件监听器。当用户想查看某条信息时，鼠标滑过时会执行mouseover的事件处理程序，在这个事件处理程序中加入对这个元素的注册函数，这样当用户执行某个动作时，如点击时，就能捕获用户的行为动作。

 

如图，Web首先调用了注入的JS文件中addHandlers方法，此方法给页面document对象添加了 this.addEvent(doc, "keyup", this.docEventHandler); this.addEvent(doc, "mousemove", this.docEventHandler)方法，同时重载了系统的函数window.alert;window.confirm;window.prompt; 添加了事件监听。

 

使得当用户执行了keyup或是mouseover动作之后就会产生一个事件（event），根据产生的事件得到触发该事件的元素—事件源，然后给这个元素注册相应的侦听器，即当发生特定类型的事件会触发相应的事件处理程序(在JavaScript中称事件句柄)。

统一的注册事件句柄的函数为attachEvents(t)，针对特定文档元素的特定类型的事件如addEvent(el, "click",onEv); 这是给el对象注册了onclick事件，事件句柄为onEv。

当特定事件发生时，比如onclick发生，则可以得到发生事件的页面元素的name,id,value,文本，类型等，将其传递给AccessorInfo，得到处理后的字符串s，利用实现了ActiveXObject异步Post的sendToServer，发送结果到服务器。

 

最后需要指出的是，本文中采用的2级DOM中的高级事件处理，在该模型中，通过调用方法注册事件句柄，而不是设置HTML属性或JavaScript属性来注册事件句柄，所以可以给一个指定的对象的指定类型的事件注册多个事件句柄。从而不至于影响了页面原始的JavaScript代码。

 

  效果图：

全部JS如下，sahi的我就不贴了。大家可以在sahi的htdocs\spr下找到，共有5个被注入到了网页，但是核心就一个concat.js。

 

  function ice(){
   
    this.real_confirm = window.confirm;
    this.real_prompt = window.prompt;
  
 this.real_alert = window.alert;
 window.alert = function (s){
      return fish.alertMock(s);
 };
    window.confirm = function (s){
  return fish.confirmMock(s);
  };
    window.prompt = function (s){
  return fish.promptMock(s);
  };
 
    //window.confirm = function (s){return fish.confirmMock(s)};
    //window.prompt = function (s){return fish.promptMock(s)};
   // window.print = function (s){return fish.printMock(s)};
}

ice.prototype.alertMock= function (s) {
   
         this.real_alert(s);
    var inp=document.getElementById("haha");
   //inp.value=s;
   var info= new AccessorInfo("null", "null", "alert", "null", "null");
         var s=info.createPostString();
        // alert(s);
     //   window.setTimeout("alert('"+s+"')",1000);
          window.setTimeout("fish.sendToServer('"+s+"')",0);
         
        //    fish.sendToServer(s);
     return;
  
}
ice.prototype.confirmMock= function (s) {
   
         var boo=this.real_confirm(s);
         var inp=document.getElementById("haha");
   inp.value=boo;
   //alert(boo);
    var info= new AccessorInfo("null", "null", "confirm", "null", boo);
         var s=info.createPostString();
        // alert(s);
         window.setTimeout("fish.sendToServer('"+s+"')",0);
           // fish.sendToServer(s);
     return;
  
}
ice.prototype.promptMock= function (s) {
   
       var boo=this.real_prompt(s);
         var inp=document.getElementById("haha");
   inp.value=boo;
   //alert(boo);
    var info= new AccessorInfo("null", "null", "prompt", "null", boo);
         var s=info.createPostString();
        // alert(s);
         window.setTimeout("fish.sendToServer('"+s+"')",0);
          //  fish.sendToServer(s);
     return;
  
}

ice.prototype.getKnowedTags = function (src){
    var el = src;
 
    while (true) {
  
        if (!el) return src;
        if (!el.tagName || el.tagName.toLowerCase() == "html" || el.tagName.toLowerCase() == "body") return null;
        var tag = el.tagName.toLowerCase();
        if (tag == "a" || tag == "select" || tag == "img" || tag == "form" ||
  tag == "input" ||
  tag == "button" ||
  tag == "textarea" ||
  tag == "textarea" ||
  tag == "td" ||
  tag == "table" ||
  ((tag == "div" || tag == "span")) ||
  tag == "label" ||
  tag == "li") {
   //alert("tag:"+el);
   return el;
  }
        el = el.parentNode;
    }
}
ice.prototype.addHandlers = function () {
  
    var doc = document;
    this.addEvent(doc, "keyup", this.docEventHandler);
    this.addEvent(doc, "mousemove", this.docEventHandler);
}

ice.prototype.addEvent = function (el, ev, fn) {
          el.attachEvent("on" + ev, fn);
  
}
ice.prototype.docEventHandler = function () {
 
    var e = window.event;
 
    var t =fish.getKnowedTags(e.srcElement);
 
 
    if (t && !t.hasAttached && t.tagName) {
  
        var tag = t.tagName.toLowerCase();
        if (tag == "select"||tag == "a" || t.form || tag == "img" || tag == "div" || tag == "span" || tag == "li" || tag == "td" || tag == "table"
         || tag == "input" || tag == "textarea" || tag == "button") {
         
      fish.attachEvents(t);
        }
        t.hasAttached = true;
    }

}
ice.prototype.attachEvents = function (el) {
 
    var tagName = el.tagName.toLowerCase();
    if (tagName == "a") {
        this.attachLinkEvents(el)

    } else if (el.type) {
        this.attachFormElementEvents(el);
    } else if (tagName == "img" || tagName == "div" || tagName == "span" || tagName == "td" || tagName == "table" || tagName == "li") {
        this.attachImageEvents(el);
    }
}

ice.prototype.attachLinkEvents = function (el) {
    this.addEvent(el, "click", this.onEv);
}
ice.prototype.attachFormElementEvents = function (el) {
    var type = el.type;
 
    if (el.onchange == this.onEv || el.onblur == this.onEv || el.onclick == this.onEv) return;
 
    if (type == "text" || type == "file" || type == "textarea" || type == "password") {
  
        this.addEvent(el, "change", this.onEv);
    } else if (type == "select-one" || type == "select-multiple") {
        fish.addEvent(el, "change", this.onEv);
    } else if (type == "button" || type == "submit" || type == "reset" || type == "checkbox" || type == "radio" || type == "image") {
        fish.addEvent(el, "click", this.onEv);
    }
}
ice.prototype.attachImageEvents = function (el) {
    this.addEvent(el, "click", this.onEv);
}
ice.prototype.onEv = function (e) {
     e.cancelBubble=true;
   
    var targ = fish.getKnowedTags(e.srcElement);
 
    if (e.type == "click") {
        if (targ.type) {
            var type = targ.type;
            if (type == "text" || type == "textarea" || type == "password"
                || type == "select-one" || type == "select-multiple") return;
        }
    }

    var info = fish.getInfo(targ);
 //alert(info.id);
 //alert(info.name);
 //alert(info.value);
 //alert(info.type);
// alert(info.event);
 
 var s=info.createPostString();
 //alert(s);
    fish.sendToServer(s);
     
}

ice.prototype.getInfo=function (el){
   
    var type = el.type;
    var tagLC = el.tagName.toLowerCase();
    if (tagLC == "img") {
        return new AccessorInfo(el.id, el.name, "img", "click",el.src);
    } else if (type == "text" || type == "textarea" || type == "password") {
        return new AccessorInfo(el.id, el.name, type, "setvalue", el.value);
    } else if (type == "select-one" || type == "select-multiple") {
        return new AccessorInfo(el.id, el.name, type, "setselected", el.value);
    } else if (tagLC == "a") {
        return new AccessorInfo(el.id, el.innerText, "link", "click" ,el.href);
    } else if (type == "button" || type == "reset" || type == "submit" || type == "image") {
        return new AccessorInfo(el.id, el.name, type, "click",el.value);
    } else if (type == "checkbox" || type == "radio") {
        return new AccessorInfo(el.id, el.name, type, "click", el.value);
    } else if (type == "file") {
        return new AccessorInfo(el.id, el.name, type, "setFile", el.value);
    } else if (tagLC == "td") {
    //    return new AccessorInfo(el.id, el.name, "cell", "click", el.innerText);
    } else if (tagLC == "div" || tagLC == "span") {
      //  return new AccessorInfo(el.id, el.name, "spandiv", "click", el.innerText);
    } else if (tagLC == "label") {
      //  return new AccessorInfo(el.id, el.name, "label", "click", el.innerText);
    } else if (tagLC == "li") {
      //  return new AccessorInfo(el.id, el.name, "listItem", "click", el.innerText);
    }
}

var AccessorInfo = function (id, name, type, event, value) {
    this.name=name;
 this.id=id;
    this.type = type;
    this.event = event;
    this.value = value;
}
function addPostParm(sp,paramname,paramvalue){
 
 if(sp.length>0){
  sp+="&icespy&";
 }
 if(paramvalue==null){
  
  paramvalue="null";
 }
  if(paramvalue.length==null){
  
  paramvalue="null";
 }
 if(paramvalue.length==0){
  paramvalue="null"
 }
 //encodeURIComponent;
 
 return sp+encodeURIComponent(paramname)+"="+encodeURIComponent(paramvalue);
}
AccessorInfo.prototype.createPostString=function(){
 var s="";
 s=addPostParm(s,"type",this.type);
 s=addPostParm(s,"name",this.name);
 s=addPostParm(s,"id",this.id);
 s=addPostParm(s,"value",this.value);
 s=addPostParm(s,"event",this.event);
 return s; 
}
ice.prototype. Create=function(){
 var aSignal=("MSXML2.XMLHTTP.5.0");
 
 var oRequest=new ActiveXObject(aSignal);
 return oRequest;
 
}
ice.prototype.sendToServer=function (s){
 var http=fish.Create();
 http.open("post","icespy.test",false);
 http.setRequestHeader("Content-Type","application/x-wwww-form-urlencoded");
 http.send(s);
 //alert(s);
 return "sucess";
}