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;
        
    }