JS京东快递单号查询 JS模拟实现京东快递单号查询
CV工程师呀 人气:0<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta http-equiv="X-UA-Compatible" content="ie=edge"> <title>Document</title> <style> * { margin: 0; padding: 0; } .search { position: relative; width: 178px; margin: 100px; } .con { display: none; position: absolute; top: -40px; width: 171px; border: 1px solid rgba(0, 0, 0, .2); box-shadow: 0 2px 4px rgba(0, 0, 0, .2); padding: 5px 0; font-size: 18px; line-height: 20px; color: #333; } .con::before { content: ''; width: 0; height: 0; position: absolute; top: 28px; left: 18px; border: 8px solid #000; border-style: solid dashed dashed; border-color: #fff transparent transparent; } </style> </head> <body> <div class="search"> <div class="con">123</div> <input type="text" placeholder="请输入您的快递单号" class="jd"> </div> <script> // 快递单号输入内容时, 上面的大号字体盒子(con)显示(这里面的字号更大) // 表单检测用户输入: 给表单添加键盘事件 // 同时把快递单号里面的值(value)获取过来赋值给 con盒子(innerText)做为内容 // 如果快递单号里面内容为空,则隐藏大号字体盒子(con)盒子 var con = document.querySelector('.con'); var jd_input = document.querySelector('.jd'); jd_input.addEventListener('keyup', function() { // console.log('输入内容啦'); if (this.value == '') { con.style.display = 'none'; } else { con.style.display = 'block'; con.innerText = this.value; } }) // 当我们失去焦点,就隐藏这个con盒子 jd_input.addEventListener('blur', function() { con.style.display = 'none'; }) // 当我们获得焦点,就显示这个con盒子 jd_input.addEventListener('focus', function() { if (this.value !== '') { con.style.display = 'block'; } }) </script> </body>
小编再为大家分享一段JS代码:
<script> var inp = document.querySelector('.inp') var son = document.querySelector('.son') inp.addEventListener('keyup', function () { if (this.value === '') { son.style.visibility = 'hidden' } else { son.style.visibility = 'visible' son.innerHTML = this.value } }) inp.addEventListener('blur', function () { son.style.visibility = 'hidden' }) inp.addEventListener('focus', function () { if (this.value !== '') { son.style.visibility = 'visible' } }) </script>
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