仿照chinadaily网页上写的一个温度转换小程序,有一点不明白
麻烦各位看一下代码:主要是注释部分不清楚,谢谢了
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>温度转换</title>
<style type="text/css">
<!--
.style1 {color: #0000FF}
-->
</style>
<script language="javascript">
function FahToCen(temp){
var centigrade=(temp-32)/1.8;
return centigrade;
}
function CenToFah(temp){
var fahrenheit=temp*1.8+32;
return fahrenheit;
}
function convert(){
var fah=document.all("tfFah").value;
var cen=document.all("tfCen").value;
if(fah!="" && cen==""){
document.all("tfCen").value=FahToCen(fah);//cen=FahToCen(fah)?
}
else if(fah=="" && cen!=""){
document.all("tfFah").value=CenToFah(cen);//fah=CenToFah(cen)?
}
}
</script>
</head>
<body>
<span class="style1">Weather</span><br>
<br>
<span class="style1">Temperature Converter</span>
<p>
</p>
<span class="style1">
<input name="tfCen" type="text" id="tfCen" size="10" onClick="document.all('tfFah').value=''">
Fahrenheit</span>
<input type="button" name="Button" value="<->" onClick="convert()">
<input name="tfFah" type="text" id="tfFah" size="10" onClick="document.all('tfCen').value=''">
<span class="style1">centigrade</span>
</body>
</html>
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为什么注释的地方换成注释后面的代码就不行了?奇怪