排序
简易倒计时
代码如下 <body> <div> <span class='day'>0</span> <span class='hour'>1</span> <span class='minute'>2</span> <span class='second'>3</span> </div> <...
模拟短信发送按钮
代码如下 <body> <input type='number'> <button>发送</button> <script> var btn = document.querySelector('button'); btn.addEventListener('click', function() { btn.disab...