function encode(s){

return s.replace(/&/g,"&").replace(//g,">").replace(/([\.*[]()$^])/g,"\$1");

}

function decode(s){

return s.replace(/\([\.*[]()$^])/g,"$1").replace(/>/g,">").replace(/

}

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(/([^<>]*)/gi,"$1");

obj.innerHTML=t;

var cnt=loopSearch(s,obj);

t=obj.innerHTML

var r=/{searchHL}(({(?!/searchHL})|[^{])*){/searchHL}/g

t=t.replace(r,"$1");

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;

}

.highlight{background:green;font-weight:bold;color:white;}