function check(form) { //alert("++++check()="+document.getElementById("keyword").value); var obj = document.getElementById(form); var re = new RegExp("[^\x20]+"); if(obj.word.value=='请输入关键词' || re.test(obj.word.value) == false) { alert("请输入要搜索的关键词!"); obj.word.focus(); return false; } return true; }