<script language="javascript" type="text/javascript">
function LENGTH_MEASURES() {
	this.mKilometer = 1000
	this.mMeter = 1
	this.mDecimeter = 0.1
	this.mCentimeter = 0.01
	this.mMillimeter = 0.001
	this.mMicronmeter = 0.000001
	this.mLimeter = 500
	this.mZhangmeter = 10 / 3
	this.mChimeter = 1 / 3
	this.mCunmeter = 1 / 30
	this.mFenmeter = 1 / 300
	this.mmLimeter = 1 / 3000
	this.engFoot = 0.3048
	this.engMile = 5280 * this.engFoot
	this.engFurlong = 660 * this.engFoot
	this.engYard = 3 * this.engFoot
	this.engInch = this.engFoot / 12
	this.nautMile = 1852
	this.nautFathom = 6 * this.engFoot
}
var length_data = new LENGTH_MEASURES();
function checkNum(str) {
	for (var i=0; i<str.length; i++)
	{
		var ch = str.substring(i, i + 1)
		if (ch!="." && ch!="+" && ch!="-" && ch!="e" && ch!="E" && (ch < "0" || ch > "9"))
		{
			alert("请输入有效的数字");
			return false;
		}
	}
	return true
}
function normalize(what,digits) {
	var str=""+what;
	var pp=Math.max(str.lastIndexOf("+"),str.lastIndexOf("-"));
	var idot=str.indexOf(".");
	if (idot>=1)
	{
		var ee=(pp>0)?str.substring(pp-1,str.length):"";
		digits+=idot;
		if (digits>=str.length)
			return str;
		if (pp>0 && digits>=pp)
			digits-=pp;
		var c=eval(str.charAt(digits));
		var ipos=digits-1;
		if (c>=5)
		{
			while (str.charAt(ipos)=="9")
				ipos--;
			if (str.charAt(ipos)==".")
			{
				var nc=eval(str.substring(0,idot))+1;
				if (nc==10 && ee.length>0)
				{
					nc=1;
					ee="e"+(eval(ee.substring(1,ee.length))+1);
				}
				return ""+nc+ee;
			}
			return str.substring(0,ipos)+(eval(str.charAt(ipos))+1)+ee;
		}
		else
			var ret=str.substring(0,digits)+ee;
		for (var i=0; i<ret.length; i++)
				if (ret.charAt(i)>"0" && ret.charAt(i)<="9")
					return ret;
		return str;
	}
	return str;
}
function compute(obj,val,data) {
	if (obj[val].value)
	{
		var uval=0;
		uval = obj[val].value*data[val];
		if( (uval >= 0) && (obj[val].value.indexOf("-") != -1) )
		{
			uval = -uval;    
		}
		for (var i in data)
			obj[i].value=normalize(uval/data[i],8);
	}
}
function resetValues(form,data) {   
		for (var i in data)
			form[i].value="";
}
function resetAll(form) {   
	resetValues(form,length_data);
}
</script>

<table width="650" borderColorDark="#ffffff" borderColorLight="#008000" border="1" cellpadding="3" cellspacing="0" align="center">
	<form action="">
	<tr height=10><td colspan=4 bgcolor="#CCE6CD" align="center">长度转换换算器 &nbsp; <a href="javascript:window.external.addfavorite('http://www.famens.com', '长度转换换算器')">←【加入收藏夹】</a></td></tr>
	<tr>
		<td align=right nowrap>公里(km)</td>
		<td align=left><input name=mKilometer size="15"> <input onClick="if (checkNum(mKilometer.value)) compute(this.form,mKilometer.name,length_data)" type=button value="换算" name=mKilometer_bt></td>
		<td align=right nowrap>米(m)</td>
		<td align=left><input name=mMeter size="15"> <input onClick="if (checkNum(mMeter.value)) compute(this.form,mMeter.name,length_data)" type=button value="换算" name=mMeter_bt></td>
	</tr>
	<tr> 
		<td align=right nowrap>分米(dm)</td>
		<td align=left><input name=mDecimeter size="15"> <input onClick="if (checkNum(mDecimeter.value)) compute(this.form,mDecimeter.name,length_data)" type=button value="换算" name=mDecimeter_bt></td>
		<td align=right nowrap>厘米(cm)</td>
		<td align=left><input name=mCentimeter size="15"> <input onClick="if (checkNum(mCentimeter.value)) compute(this.form,mCentimeter.name,length_data)" type=button value="换算" name=mCentimeter_bt></td>
	</tr>
	<tr> 
		<td align=right nowrap>毫米(mm)</td>
		<td align=left><input name=mMillimeter size="15"> <input onClick="if (checkNum(mMillimeter.value)) compute(this.form,mMillimeter.name,length_data)" type=button value="换算" name=mMillimeter_bt></td>
		<td align=right nowrap>微米(um)</td>
		<td align=left><input name=mMicronmeter size="15"> <input onClick="if (checkNum(mMicronmeter.value)) compute(this.form,mMicronmeter.name,length_data)" type=button value="换算" name=mMicronmeter_bt></td>
	</tr>
	<tr> 
		<td align=right nowrap>里</td>
		<td align=left><input name=mLimeter size="15"> <input onClick="if (checkNum(mLimeter.value)) compute(this.form,mLimeter.name,length_data)" type=button value="换算" name=mLimeter_bt></td>
		<td align=right nowrap>丈</td>
		<td align=left><input name=mZhangmeter size="15"> <input onClick="if (checkNum(mZhangmeter.value)) compute(this.form,mZhangmeter.name,length_data)" type=button value="换算" name=mZhangmeter_bt></td>
	</tr>
	<tr> 
		<td align=right nowrap>尺</td>
		<td align=left><input name=mChimeter size="15"> <input onClick="if (checkNum(mChimeter.value)) compute(this.form,mChimeter.name,length_data)" type=button value="换算" name=mChimeter_bt></td>
		<td align=right nowrap>寸</td>
		<td align=left><input name=mCunmeter size="15"> <input onClick="if (checkNum(mCunmeter.value)) compute(this.form,mCunmeter.name,length_data)" type=button value="换算" name=mCunmeter_bt></td>
	</tr>
	<tr> 
		<td align=right nowrap>分</td>
		<td align=left><input name=mFenmeter size="15"> <input onClick="if (checkNum(mFenmeter.value)) compute(this.form,mFenmeter.name,length_data)" type=button value="换算" name=mFenmeter_bt></td>
		<td align=right nowrap>厘</td>
		<td align=left><input name=mmLimeter size="15"> <input onClick="if (checkNum(mmLimeter.value)) compute(this.form,mmLimeter.name,length_data)" type=button value="换算" name=mmLimeter_bt></td>
	</tr>
	<tr> 
		<td align=right nowrap>海里(nmi)</td>
		<td align=left><input name=nautMile size="15"> <input onClick="if (checkNum(nautMile.value)) compute(this.form,nautMile.name,length_data)" type=button value="换算" name=nautMile_bt></td>
		<td align=right nowrap>英寻</td>
		<td align=left><input name=nautFathom size="15"> <input onClick="if (checkNum(nautFathom.value)) compute(this.form,nautFathom.name,length_data)" type=button value="换算" name=nautFathom_bt></td>
	</tr>
	<tr> 
		<td align=right nowrap>英里(mi)</td>
		<td align=left><input name=engMile size="15"> <input onClick="if (checkNum(engMile.value)) compute(this.form,engMile.name,length_data)" type=button value="换算" name=engMile_bt></td>
		<td align=right nowrap>弗隆(fur)</td>
		<td align=left><input name=engFurlong size="15"> <input onClick="if (checkNum(engFurlong.value)) compute(this.form,engFurlong.name,length_data)" type=button value="换算" name=engFurlong_bt></td>
	</tr>
	<tr> 
		<td align=right nowrap>码(yd)</td>
		<td align=left><input name=engYard size="15"> <input onClick="if (checkNum(engYard.value)) compute(this.form,engYard.name,length_data)" type=button value="换算" name=engYard_bt></td>
		<td align=right nowrap>英尺(ft)</td>
		<td align=left><input name=engFoot size="15"> <input onClick="if (checkNum(engFoot.value)) compute(this.form,engFoot.name,length_data)" type=button value="换算" name=engFoot_bt></td>
	</tr>
	<tr> 
		<td align=right nowrap>英寸(in)</td>
		<td align=left><input name=engInch size="15"> <input onClick="if (checkNum(engInch.value)) compute(this.form,engInch.name,length_data)" type=button value="换算" name=engInch_bt></td>
		<td colspan=3><div align="right"><input onClick=resetAll(this.form) type=button value="数据重置" name=res7></div></td>
	</tr>
</table>