<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>成都机动车查询限号</title>
<style type="text/css">
#search{
width: 640px;
margin: 0 auto;
text-align: center;
margin-top: 150px;
}
#carno{
display: inline-block;
width: 320px;
height: 36px;
font: 36px/36px arial;
text-align: center;
vertical-align: middle;
border: none;
outline: none;
border-bottom: 1px dotted darkgray;
}
#search input[type = button]{
width: 80px;
height: 36px;
font: 28px/36px arial;
border: none;
color: white;
background-color: palevioletred;
vertical-align: middle;
}
#result{
width: 640px;
margin: 0 auto;
text-align: center; /* 字体居中 */
font: 32px/36px arial;
}
#empty input{
width: 80px;
height: 36px;
font: 28px/36px arial;
border: none;
color: white;
background-color: palevioletred;
}
</style>
</head>
<body>
<div id="search">
<input type="text" id="carno" placeholder="请输入车牌号">
<input type="button" value="查询" onclick="showResult()">
<input type="button" value="清空" onclick="empty()">
</div>
<hr>
<p id="result"></p>
<script>
function showResult() {
var input = document.getElementById('carno');
var p = document.getElementById('result');
var carNo = input.value;
var regex = /^[川渝云浙贵京津沪][A-Z]\s*[0-9A-Z]{5}$/;
if (regex.test(carNo)) {
var digitStr = lastDigit(carNo);
if (digitStr) {
var digit = parseInt(digitStr);
var day = new Date().getDay();
if (digit % 5 == day || digit % 5 == day - 5) {
p.innerHTML = carNo +'今日限行<br>' + p.innerHTML;
} else{
p.innerHTML = carNo +'今日不限行<br>' + p.innerHTML;
}
} else{
p.innerHTML = carNo + '不是有效车牌号<br>' + p.innerHTML;
}
}else{
p.innerHTML = carNo + '不是有效的车牌好<br>' + p.innerHTML;
}
input.value = '';
}
function lastDigit(str) {
for (var index = str.length - 1; index >= 0; index -= 1) {
var digitStr = str[index];
if (digitStr >= '0' && digitStr <= '9') {
return digitStr;
}
}
return null;
}
function empty() {
document.getElementById('result').textContent='';
}
</script>
</body>
</html>
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