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ECHO.js 純javascript輕量級消極式載入的執行個體代碼
示範
<!DOCTYPE html><html lang="zh-CN"><head><meta charset="utf-8"><title>簡單的JavaScript映像消極式載入庫Echo.js</title><style>.demo img { width: 736px; height: 490px; background: url(images/loading.gif) 50% no-repeat;}</style></head><body><h1 style="margin: 40px; font: 32px Microsoft Yahei; text-align: center;">簡單的JavaScript映像消極式載入庫Echo.js示範</h1><div class="demo" style="width: 736px; margin: 0 auto;"> <img class="lazy" src="images/blank.gif" data-echo="images/big-1.jpg"> <img class="lazy" src="images/blank.gif" data-echo="images/big-2.jpg"> <img class="lazy" src="images/blank.gif" data-echo="images/big-3.jpg"> <img class="lazy" src="images/blank.gif" data-echo="images/big-4.jpg"> <img class="lazy" src="images/blank.gif" data-echo="images/big-5.jpg"> <img class="lazy" src="images/blank.gif" data-echo="images/big-6.jpg"> <img class="lazy" src="images/blank.gif" data-echo="images/big-7.jpg"></div><script src="js/echo.min.js"></script><script>Echo.init({ offset: 0, throttle: 0});</script>
應用
1.引入js, 並初始化
<script src="{sh::PUB}js/echo.min.js"></script><script>Echo.init({ offset: 0, throttle: 0});</script>
2.給圖片附上屬性
<img class="lazy" src="{sh::PUB}img/common/blank.gif" data-echo="{sh:$goods.logoimg}" alt="">
3.給未載入的圖片設定預設背景，動態gif
.lazy{width:100%;height:100%;background: url({sh::PUB}img/common/loading.gif) 50% no-repeat;}
很方便，很實用。
要想進一步提升網頁開啟速度，可以最佳化上傳的圖片。
網頁慢，無非是，一查詢慢，二圖片載入慢，三沒有使用消極式載入，四圖片資料太大。
根據這些原因，逐步解決。
提升使用者體驗。
以上這篇ECHO.js 純javascript輕量級消極式載入的執行個體代碼就是小編分享給大家的全部內容了，希望能給大家一個參考，也希望大家多多支援雲棲社區。
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