请问霍夫曼编码和ascii编码有什么关系吗,他们区别在哪。我有点晕

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请问霍夫曼编码和ascii编码有什么关系吗,他们区别在哪。我有点晕,第1张

  哈夫曼编码(Huffman Coding),又称霍夫曼编码,是一种编码方式,哈夫曼编码是可变字长编码(VLC)的一种。Huffman于1952年提出一种编码方法,该方法完全依据字符出现概率来构造异字头的平均长度最短的码字,有时称之为最佳编码,一般就叫做Huffman编码(有时也称为霍夫曼编码)。

ASCII(American Standard Code for Information Interchange,美国标准信息交换代码)是基于拉丁字母的一套电脑编码系统,主要用于显示现代英语和其他西欧语言。它是现今最通用的单字节编码系统,并等同于国际标准ISO/IEC 646。

霍夫曼编码是一种编码方式,ASCII码是一种语言编码系统也就是用来对语言做输入编码的。

参考链接:

哈夫曼编码_百科词条

http://baike.baidu.com/link?url=CGLZFJxud6sI2WqJ2H3ljcMqG8zRRRVTJN7plT619dqZ2uwyuUIJn19_Ejnv8-nKyaIWflhorkZV_NtuqUAorK

ASCII_百科词条

http://baike.baidu.com/link?url=l_vl6PD50lcsVFj9oNVF10rKQnJsMN8c0l64PHyQI8tZrSzKgG2BtWtQNQuqYiRcnU1Kjh6Xzxjl2F20F8y-otBDj0ImPSpk9Nt3QurjKN1Ct3cvoZI63mSSp5nYsdr4qr9QOMj16kGx3lrKIHtD-sVFQHWxfUm3-m05dAX8IYK

加个函数修改下 就可以了

<html>

<head>

<meta http-equiv="Content-Type" content="text/htmlcharset=gb2312">

<link rel="stylesheet" href="finance.css">

<title>合计</title>

</head>

<body background="image/beg1.gif" leftmargin="0" topmargin="0">

<br>

<form id="frmxx" name="frmxx" action="Manager_F_budgeteeringSave.asp" method=post >

<table width="800" border="0" align=center cellpadding="0" cellspacing="0" class="tableframe">

<tr align=center class=Listtitle>

<td class=listcelltitle width=50 align=center>2008年报表</td>

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<input name="data61" type="text" value="120" size="20">

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<tr align=left class=listrow1_1>

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<input name="data658" type="text" value="0" size="20">

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<tr align=left class=listrow1>

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</div></td>

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<td class=listcellrow nowrap align=right><div align="center">

<input name="data660" type="text" value="0" size="20">

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</div></td>

</tr>

<tr class=listrow1_1>

<td colspan="9" nowrap class=listcellrow>

<div align="center">合计值文本框:

<input name="sumdata" type="text" value="0" size="20" onfocus="sumhe()">

</div></td>

</tr>

</table>

</form>

<script>

window.onload=sumhe

window.document.onkeyup=sumhe

function sumhe(){

var lens,kk

kk=0

lens=document.frmxx.elements.length-1

for(i=1i<=lensi++){

kk+=parseFloat(eval('document.frmxx.data6'+i+'').value)

}

document.frmxx.sumdata.value=kk

}

</script>

</body>

</html>

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