请问，在HTML代码中，<span index=1></span>是什么意思，这个index
这是一个图片轮播器，请问在HTML代码中的index=1是什么意思？见代码155--159行
焦点轮播图 *{ margin: 0; padding: 0; text-decoration: none;} body { padding: 20px;} #container { width: 600px; height: 400px; border: 3px solid #333; overflow: hidden; position: relative;} #list { width: 4200px; height: 400px; position: absolute; z-index: 1;} #list img { float: left;} #buttons { position: absolute; height: 10px; width: 100px; z-index: 2; bottom: 20px; left: 250px;} #buttons span { cursor: pointer; float: left; border: 1px solid #fff; width: 10px; height: 10px; border-radius: 50%; background: #333; margin-right: 5px;} #buttons .on { background: orangered;} .arrow { cursor: pointer; display: none; line-height: 39px; text-align: center; font-size: 36px; font-weight: bold; width: 40px; height: 40px; position: absolute; z-index: 2; top: 180px; background-color: RGBA(0,0,0,.3); color: #fff;} .arrow:hover { background-color: RGBA(0,0,0,.7);} #container:hover .arrow { display: block;} #prev { left: 20px;} #next { right: 20px;} <script type="text/javascript"> window.onload = function () { var container = document.getElementById('container'); var list = document.getElementById('list'); var buttons = document.getElementById('buttons').getElementsByTagName('span'); var prev = document.getElementById('prev'); var next = document.getElementById('next'); var index = 1; var len = 5; var animated = false; var interval = 3000; var timer; function animate (offset) { if (offset == 0) { return; } animated = true; var time = 300; var inteval = 10; var speed = offset/(time/inteval); var left = parseInt(list.style.left) + offset; var go = function (){ if ( (speed > 0 && parseInt(list.style.left) < left) || (speed < 0 && parseInt(list.style.left) > left)) { list.style.left = parseInt(list.style.left) + speed + 'px'; setTimeout(go, inteval); } else { list.style.left = left + 'px'; if(left>-200){ list.style.left = -600 * len + 'px'; } if(left |
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给这个元素添加一个属性，然后你的原理估计就是按照这个属性值给元素排序 |
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