标签：alt var back title class blank 结束 oct 使用
<!doctype html> <html lang="en"> <head> <title>hangge.com</title> <style> img { position:absolute; transition: opacity 5s; -webkit-transition: opacity 5s; } .solid { opacity: 1; } .transparent { opacity: 0; } </style> <script> function toNight(){ var nightImage = document.getElementById("nightImage"); nightImage.className = "solid"; } function toDay(){ var nightImage = document.getElementById("nightImage"); nightImage.className = "transparent"; } </script> </head> <body> <button onclick="toNight()">看夜景</button> <button onclick="toDay()">看日景</button> <div> <img src="day.png" alt="日景"/> <img src="night.png" alt="夜景" id="nightImage" class="transparent"/> </div> </body> </html>
标签：alt var back title class blank 结束 oct 使用
原文地址：http://www.cnblogs.com/HDK2016/p/6303318.html
