本文实例为大家分享了JS实现京东快递单号查询的具体代码,供大家参考,具体内容如下
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<!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 >
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小编再为大家分享一段JS代码:
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<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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以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持服务器之家。
原文链接:https://blog.csdn.net/qq_44954571/article/details/107288975