jquery实现页面关键词高亮显示的方法

jQuery.fn.extend({
    highlight: function(search, configs){
        if(typeof(search) == 'undefined') return;
        var configs =  jQuery.extend({
            insensitive: 1, //是否匹配大小写  0匹配 1不匹配
            hls_class: 'highlight', // 高亮后的class
            clear_last: true, // 清除原来高亮的结果
        },configs);  
        if(configs.clear_last) {
            $(this).find("strong."+configs.hls_class).each(function(){
                $(this).after($(this).text());
                $(this).remove();
            })
        }
        return this.each(function() {
            if(typeof(search) == "string") {
                $(this).highregx(search,configs);
            } else if (search.constructor === Array ) {
                for(var query in search){
                    var search_str = $.trim(search[query]);
                    if(search_str != "") $(this).highregx(search_str,configs);
                }
            }
        });              
    },             
    highregx: function(query,configs){
        query = this.unicode(query);
        var regex = new RegExp("(<[^>]*>)|("+ query +")", configs.insensitive ? "ig" : "g");      
        this.html(this.html().replace(regex, function(a, b, c){
            return (a.charAt(0) == "<") ? a : "<strong class=\""+ configs.hls_class +"\">" + c + "</strong>";
        }));
    },
    unicode: function(s){
         var len=s.length;
         var rs="";
         s = s.replace(/([-.*+?^${}()|[\]\/\\])/g,"\\$1");
         for(var i=0;i<len;i++){
            if(s.charCodeAt(i) > 255)
                rs+="\\u"+ s.charCodeAt(i).toString(16);
            else rs +=  s.charAt(i);
         }  
         return rs;
    } 
});