js 得到表格中 所有id以字符串 “bannerline”开头的行

 function myfun(){
       var pattern = /^bannerline/;
       var trs = document.getElementById("bannerTable").rows;
       for(var i = 1; i           var tr = trs[i];
          if(pattern.exec(tr.id)
             alert('begin with bannerline');
       }
}