js实现当前页面内容搜索检索功能

2016-10-02 网页编程网 网页编程网

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>js页面搜索</title>
<script type="text/javascript">
function encode(s){
  return s.replace(/&/g,"&").replace(/</g,"<").replace(/>/g,">").replace(/([\\\.\*\[\]\$\^])/g,"\\$1");
}
function decode(s){
  return s.replace(/\$[\\\.\*\[\]\($\$\^])/g,"$1").replace(/>/g,">").replace(/</g,"<").replace(/&/g,"&");
}
function highlight(s){
  if (s.length==0){
    alert('搜索关键词未填写！');
    return false;
  }
  s=encode(s);
  var obj=document.getElementsByTagName("body")[0];
  var t=obj.innerHTML.replace(/<span\s+class=.?highlight.?>([^<>]*)<\/span>/gi,"$1");
  obj.innerHTML=t;
  var cnt=loopSearch(s,obj);
  t=obj.innerHTML
  var r=/{searchHL}(({(?!\/searchHL})|[^{])*){\/searchHL}/g
  t=t.replace(r,"<span class='highlight'>$1</span>");
  obj.innerHTML=t;
  alert("搜索到关键词"+cnt+"处")
}
function loopSearch(s,obj){
  var cnt=0;
  if (obj.nodeType==3){
    cnt=replace(s,obj);
    return cnt;
  }
  for (var i=0,c;c=obj.childNodes[i];i++){
    if (!c.className||c.className!="highlight")
      cnt+=loopSearch(s,c);
  }
  return cnt;
}
function replace(s,dest){
  var r=new RegExp(s,"g");
  var tm=null;
  var t=dest.nodeValue;
  var cnt=0;
  if (tm=t.match(r)){
    cnt=tm.length;
    t=t.replace(r,"{searchHL}"+decode(s)+"{/searchHL}")
    dest.nodeValue=t;
  }
  return cnt;
}
</script>
<style type="text/css">
.highlight{background:green;font-weight:bold;color:white;}
</style>
</head>
<body>
<form onsubmit="highlight(this.s.value);return false;">
<p><input name="s" id="s" title="输入要搜索的关键词看看"/><input type="submit" value="搜索"/></p>
</form>
<div id="content">
<font face=Verdana>你是一只狗吗？are you a dog<br />
专注于网页特效及广告代码,供站长和js爱好者参考.<br />
<br />
这次上当了，被骗了，真tmd上火。
<br />
欢迎收藏本站,您的选择是不会错的.
<br />
你就是一只狗吗？,永远是最帅的!</font>
</div>
</body>
</html>

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