提示:您可以先修改部分代碼再運行
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"><head> <title>JavaScript實現文字框提示效果</title> <style type="text/css"> *{ margin:0px;padding:0px;font-size:12px; } input{ width:100px;height:20px;border:1px solid #ccc; } </style></head><body><script language="javascript">function tips(id,str){var l=document.getElementById(id).offsetLeft+120;var t=document.getElementById(id).offsetTop;document.getElementById("tips").innerHTML="提示:"+str;document.getElementById("tips").style.left=l+"px";document.getElementById("tips").style.top=t+"px";document.getElementById("tips").style.display="";}function outtips(){ document.getElementById("tips").style.display='none';}</script><div id="tips" ></div><br />姓名:<input type="text" id="username" onfocus="tips('username','姓名長度最多16個字元')" onblur="outtips()" /><br />密碼:<input type="password" id="password" onfocus="tips('password','密碼長度必須在3-18位之間')" onblur="outtips()" /></body></html></td> </tr></table>
提示:您可以先修改部分代碼再運行