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javascript自動獲取Tags關鍵字

網絡 2010/2/9 14:44:31 深山行者字體:大中小瀏覽 9589

以下為詳細代碼

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"><head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312"><title>無標題文檔</title>
<style>
body{
	background:#E2E9ED;
	}
#title{
	font-size:12px;
	}
#title a{
	margin-top:2px;
	display:block;
	height:16px;
	line-height:16px;
	width:300px;
	cursor:pointer;
	background:#C2DBE2;
	}
#title a a:hover{
	background:#FFFFCC;
	}
.txt{
	color:#FF0000;
	}
#result{
	float:left;
	margin-left:20px;
	}
#result span{
	color:#FF0000;
	}
#input{
	width:510px;
	margin:auto;
	padding-bottom:10px;
	}
.txt{
	padding-left:100px;
	}
</style></head><body>
<div id="input">
<input name="intfx" value="" id="intfx" type="text">請輸入閾值
<input name="indesc" value="3" id="indesc" type="text">請輸入標引深度
<br>
<span class="txt">輸入后請點擊任何一篇標題獲取結果</span>
</div>
<div id="drop" style="display: none;"></div>
內容：<textarea name="keywords" cols="100" rows="10" id="keywords">美國各界中國人士強烈批評美限制中國紡織品進口中國連日來，美國各界許多有影響的人士紛紛對布什政府這種為了競選需要置國家長遠利益于不顧的做法提出批評。美國紡織品和服裝進口商協會負責人勞拉·瓊斯說，限制中國紡織品的進口絲毫無助于美國就業機會的增加，惟一的結果是美國擴大從其它國家的進口。美國前財政部長、花旗銀行執行委員會主席魯賓稱，政府的這種貿易保護主義措施十分有害。美國聯邦儲備委員會主席格林斯潘則認為，政府的措施不僅無助、而且有害于美國經濟和世界經濟，他還敦促人們警惕貿易保護主義抬頭。
　　華爾街著名經濟學家、摩根士丹利首席經濟學家斯蒂芬·羅奇在接受記者采訪時明確指出，美國政府的這一措施是錯誤的，無異于向美國消費者額外征稅。他同時表示，美中間的貿易爭端應當通過協商機制來解決。
　　此間分析家指出，從中國進口的上述紡織品并不像美國某些人所說的那樣正在“擠占”美國本地制造商的市場份額，原因是美國大部分制造商多年前就已經將這些產品的生產過程外包，采購商也不再在本地采購同類產品。此外，中國出口到美國市場的紡織品中，很大一部分是美國本地服裝企業在中國生產的返銷產品，中方除了賺取一小部分加工費用外，絕大部分利潤都流入了美國人的腰包。
　　中美兩國貿易已經形成了高度相互依賴的格局。例如，中國已成為美國棉花的主要進口國之一，美國農業部曾估計中國今年從美國進口的原棉會達到創記錄的７００萬包（每包合２１８公斤）。但布什政府的限制措施一出臺，紐約商品交易所棉花期貨價格大幅下跌。這對美國棉農和棉花經銷商們顯然不是一個好消息。因此，美國政府限制從中國的進口，也是限制美國企業的發展空間，損害的不僅是中國出口企業的利益，也是美國企業和消費者的利益。</textarea>
<input type="button" onclick="lastIndexDemo();"  value="提取關鍵詞"/><br />
TAGS：<input name="tags" type="text" id="tags" style="width:300px;" /><br />
<br />
<div id="result">
您所選擇的題目是<br><span id="outtit">美國各界人士強烈批評美限制中國紡織品進口</span><br>
此文章包含關鍵詞<br><span id="outkey">進口,紡織品,中國,限制,批評</span><br>
以上關鍵詞對應權重為<br><span id="outtfx">5.991,2.996,0.693,2.996,2.996</span><br>
此文章包含停用詞<br><span id="outstop">強烈,人士</span><br>
您的標引閾值為<br><span id="outval">2</span><br>
關鍵詞中符合并可作為標引詞的有<br><span id="outword">進口,紡織品,限制,批評</span><br>
您的標引深度為<br><span id="outdeep">3</span><br>
最后確定的標引詞為<br><span id="outkeyword">進口,紡織品,限制</span><br>
</div>
<script>
var keylis = new Array("貿易","制裁","改造","中國","經濟","中國經濟","拯救","美國","美國經濟","整頓","銀行業","銀行","速度","溫家寶","美中","逆差","貿易逆差","結構性","轉移性","機電","進出口","商會","彩電","傾銷","稅率","交涉","東北","亞洲","亞洲經濟","論壇","增長","失業率","失業","回落","批評","限制","紡織品","進口","加拿大","統計","移民","收入","差異","中央銀行","中央","商業銀行","政策","措施","經濟發展","發展","日本","日本經濟","復蘇","決定","鍛鑄","鐵管","管件","征收","反傾銷","壟斷","傾銷稅","聯合國","聯合","實施","伊拉克","石油","食品","計劃","發展中國家","發達國家","國家","家電","電信","產業","電子","信息","產銷","俄羅斯","檢察官","檢察","首富","犯罪","調查","結束","歐盟","爭端","投資","受挫","改革","委員會","委員","實行","臨時","價格","干預","施行","美聯儲","警告","通貨膨脹","膨脹","下滑","衰退","季度","揚言","演示簡單","后臺");
var keydrop="";
function delHtmlTag(str) 
{ 
   return str.replace(/<[^>]+>/g,"");//去掉所有的html標記 
}
function lastIndexDemo(a)
{
   var str = delHtmlTag(document.getElementById("keywords").value);//獲取字符串
  var keys = new Array;//詞表存儲序列
  var titles = new Array;
  var key = new Array;//關鍵詞對象存儲序列
  var gotkey = new Array();//關鍵詞對象
  var name = new Array();//關鍵詞name
  var address = new Array();//關鍵詞在詞表中位置
  var times = new Array();//關鍵詞在本篇目中的出現次數
  var tfx = new Array();//關鍵詞tfx值
  var stopkey = new Array();//關鍵詞是否為停用詞
  var desc = new Array();//關鍵詞排名
  var strkey;// 聲明變量預存關鍵字
  var strl = str.length;//獲取字符串長度
  getkeywords(keys,titles);//初始化關鍵詞表和標題序列
  getkey(str,strkey,strl,keys,key,name,address,stopkey);//獲取關鍵詞，詞表位置，是否停用
  timesn(times,address);//獲取n（出現多少次）
  gettfx(times,tfx);
  toobject(key,address,times,tfx,stopkey,name);
  outresult(key,address,times,tfx,stopkey,name,str);
                     
}
function getkeywords(keys,titles){
	var titl = 1;
	var keyl = keylis.length;
	var keyd = keydrop.length;
	for(i=0;i<keyl;i++){
		keys[i] = keylis[i];
		}
	for(i=0;i<keyd;i++){
		keys[i+keyl] = keydrop[i].childNodes[0].nodeValue;
		}
	for(i=0;i<titl;i++){
		titles[i] = document.getElementById("keywords").value;
		}
		
	
}
function timesn(times,address){
	var k = 0;
	for(i=0;i<address.length;i++)
		{
			for(j=0;j<address.length;j++)
				{	
					if(address[i] == address[j])
					{	k = k+1;}
				}
			times.push(k);
			k = 0;
		}
}
function gettfx(times,tfx){
	var k = Math.log(10);
	var l;
	var j;
	var m;
	var n;
	for(i=0;i<times.length;i++)
	{
		l = times[i]/1;
		j = Math.log(l);
		n = times[i]*j;
		tfx.push(n.toFixed(3));
	}
}
function toobject(key,address,times,tfx,stopkey,name){
	var gotdkey = new Array;
	key["name"] = name;
	key["address"] = address;
	key["tfx"] = tfx;
	key["stopkey"] = stopkey;
	key["times"] = times;
	
}
function getkey(str,strkey,strl,keys,key,name,address,stopkey){
	for(k=strl;k>0;k--){//控制循環次數
	
		   label:
		   for(j=6;j>0;j--)//通過最大關鍵字長度控制循環
				{
					var strkey = str.substr(k-j, j);
					
					//確定預檢索字符串 strl-j 是位置 j是長度
					for(i=0;i<keys.length;i++)//通過關鍵字字庫的數量確定循環次數
					{
						if(keys[i]==strkey){//如果現有關鍵字與字庫匹配
							name.push(strkey);
							address.push(i);
							if(i>keylis.length){
							stopkey.push(false);
							}
							else{
							stopkey.push(true);
							}
							k-=j;
							k++;
							break label;
						}
						
					}
				}	
		}
}
function outresult(key,address,times,tfx,stopkey,name,str){
	var outtit = document.getElementById("outtit");
	var outkey = document.getElementById("outkey");
	var outtfx = document.getElementById("outtfx");
	var outstop = document.getElementById("outstop");
	var outval = document.getElementById("outval");
	var outword = document.getElementById("outword");
	var outdeep = document.getElementById("outdeep");
	var outkeyword = document.getElementById("outkeyword");
	var outtags = document.getElementById("tags");
	var indesc = document.getElementById("indesc").value;
	var intfx = document.getElementById("intfx").value;
	var outkeyarray = new Array();
	var outkeyarray1 = new Array();
	var outkeystoparray = new Array();
	var outwordarray = new Array();
	var outtfxarray = new Array();
	var outtfxarray1 = new Array();	
	outtit.firstChild.nodeValue = str;
	
	for(i=0;i<name.length;i++)
	{
		
		if(key["stopkey"][i] == true)
		{outkeyarray.push(key["name"][i]);
		 outtfxarray.push(key["tfx"][i]);}
		 
	}
	for(i=0;i<outkeyarray.length;i++)
	{
		for(j=outkeyarray.length;j>i;j--)
		{
			if(outkeyarray[i] == outkeyarray[j])
			{
				outkeyarray = outkeyarray.slice(0,j).concat(outkeyarray.slice(j+1,outkeyarray.length));
				outtfxarray = outtfxarray.slice(0,j).concat(outtfxarray.slice(j+1,outtfxarray.length));
			}
		}
	
		
	}
	
	outkey.firstChild.nodeValue = outkeyarray.join(",");
	outtfx.firstChild.nodeValue = outtfxarray.join(",");
	//
	for(i=0;i<name.length;i++)
	{
		
		if(key["stopkey"][i] == false)
		{outkeystoparray.push(key["name"][i]);}
	}
	outstop.firstChild.nodeValue = outkeystoparray.join(",");
	//
	
	outval.firstChild.nodeValue = intfx;
	//
	for(i=0;i<outkeyarray.length;i++)
	{
		
		if(outtfxarray[i]>intfx)
		{outwordarray.push(outkeyarray[i]);
		 outtfxarray1.push(outtfxarray[i])}
	}
	outword.firstChild.nodeValue = outwordarray.join(",");
	outdeep.firstChild.nodeValue = indesc;
	for(i=0;i<outwordarray.length;i++)
	{ var k,l;
		for(j=i+1;j<outwordarray.length;j++)
		{
			if(outtfxarray1[i]<outtfxarray1[j])
			{	k=outtfxarray1[i];outtfxarray1[i]=outtfxarray1[j];outtfxarray1[j]=k;
				l=outwordarray[i];outwordarray[i]=outwordarray[j];outwordarray[j]=l;
			
			}
		}
	
	}
	
	outwordarray = outwordarray.slice(0,indesc)
	outkeyword.firstChild.nodeValue = outwordarray.join(",");
	outtags.value = outwordarray.join(",");
}
</script>
</body>
</html>

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