判断车牌号今日是否限行
<html>
<head>
<meta charset="utf-8">
<title></title>
</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()">
<button type="button" onclick="claer()">清空查询结果</button>
</div>
<p id="result"></p>
<script>
function claer()
{
var p = document.getElementById('result')
p.innerHTML = ''
}
function showResult()
{
var input = document.getElementById('carno')
var p = document.getElementById('result')
var carNo = input.value;
var regex = /^[川渝云贵][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 + '不是有效车牌号<br>' + p.innerHTML
}
}
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
}
</script>
</body>
</html>
import this
----zen of python
Beautiful is better than ugly.
# 优美胜于丑陋（Python以编写优美的代码为目标）
Explicit is better than implicit.
# 明了胜于晦涩（优美的代码应当是明了的，命名规范，风格相似）
Simple is better than complex.
# 简洁胜于复杂（优美的代码应当是简洁的，不要有复杂的内部实现）
Complex is better than complicated.
# 复杂胜于凌乱（如果复杂不可避免，那代码间也不能有难懂的关系，要保持接口简洁）
Flat is better than nested.
# 扁平胜于嵌套（优美的代码应当是扁平的，不能有太多的嵌套）
Sparse is better than dense.
# 间隔胜于紧凑（优美的代码有适当的间隔，不要奢望一行代码解决问题）
Readability counts.
# 可读性很重要（优美的代码是可读的）
Special cases aren't special enough to break the rules.
Although practicality beats purity.
# 即便假借特例的实用性之名，也不可违背这些规则（这些规则至高无上）
Errors should never pass silently.
Unless explicitly silenced.
# 不要包容所有错误，除非你确定需要这样做（精准地捕获异常，不写except:pass风格的代码）
In the face of ambiguity, refuse the temptation to guess.
# 当存在多种可能，不要尝试去猜测
There should be one-- and preferably only one --obvious way to do it.
# 而是尽量找一种，最好是唯一一种明显的解决方案（如果不确定，就用穷举法）
Although that way may not be obvious at first unless you're Dutch.
# 虽然这并不容易，因为你不是 Python 之父（这里的Dutch是指Guido）
Now is better than never.
Although never is often better than *right* now.
# 做也许好过不做，但不假思索就动手还不如不做（动手之前要细思量）
If the implementation is hard to explain, it's a bad idea.
If the implementation is easy to explain, it may be a good idea.
# 如果你无法向人描述你的方案，那肯定不是一个好方案；反之亦然（方案测评标准）
Namespaces are one honking great idea -- let's do more of those!
# 命名空间是一种绝妙的理念，我们应当多加利用（倡导与号召）
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