var o = document.querySelectorAll("#anqu");for (var i = 0; i < o.length; i++){    o[i].innerHTML = o[i].innerHTML.replace(/gaosudu/g,"tuicha");}

$("div [id=anqu]").each(function(){           console.log(2);      $(this).html().replace(/gaosudu/g,"tuicha");   });