html页面高亮关键词

 function hightLightTheKeyWord(searchParam,$dom){
        if(searchParam&&!/^\s*$/.test(searchParam)){
            searchParam=regTrim(searchParam);
            var contents=$dom.html();
            var pattern=new RegExp('('+searchParam+')(?=[^<>]*<)','gim');
            contents=contents.replace(pattern,"<span style='color:blue'>$1</span>");
            $dom.html(contents);
        }
    }

    function regTrim(s){
        var imp=/[\^\.\\\|\(\)\*\+\-\$\[\]\?]/g;
        var imp_c={
                "^":"\\^",
                ".":"\\.",
                "\\":"\\\\",
                "|":"\\|",
                "(":"\\(",
                ")":"\\)",
                "*":"\\*",
                "+":"\\+",
                "-":"\\-)",
                "$":"\\$)",
                "[":"\\[)",
                "]":"\\])",
                "?":"\\?"
        };
        s.replace(imp,function(o){
            return imp_c[o];
        });
        return s;

    }