javascript网页关键字高亮代码

//高亮网页关键字的javascript代码 

var keys = [ 
             ["脚本",https://www.jb51.net,"#ff0000"], 
             ["小说",http://www.kanshule.com,"#00ff00"], 
             ["念经","http://www.baidu.com","#0000ff"], 
             ["工会","http://www.baidu.com","#cc6600"] 
           ] 
var bookmark; 
if(document.createRange){ 
    var range = document.createRange(); 
}else{ 
    var range = document.body.createTextRange(); 
    bookmark = range.getBookmark(); 
} 
var key; 
for(var i = 0;key = keys[i];i++){ 
    if(range.findText){ 
        range.collapse(true); 
        range.moveToBookmark(bookmark); 
        while(range.findText(key[0])){ 
            range.pasteHTML(range.text.fontcolor(key[2])); 
        } 
    }else{ 
        var s,n; 
        s = window.getSelection(); 
        s.collapse(document.body,0); 
        while(window.find(key[0])){ 
            var n = document.createElement("SPAN"); 
            n.style.color=key[2]; 
            s.getRangeAt(0).surroundContents(n); 
        } 
    } 
}