摘要：
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title></title> <style type="text/css"> #box{ width: 100px; height: 100px; background-color: #F0F 阅读全文
摘要：
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title></title> <script type="text/javascript"> window.onload=function(){ var oBtn=document.getEl 阅读全文