分享一款面积换算js脚本，输入数值后点击按钮可立即换算成其他单位的面积值，实用网页特效代码。
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<meta http-equiv="content-Type" content="text/html;charset=gb2312">
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<title>面积换算js脚本_武鸣人</title>
<SCRIPT language=JScript type=text/JScript>
<!--
function AREA_MEASURES()
{//武鸣人网站https://www.wuming.ren 网站很好记住，wuming.ren(武鸣拼音.ren域名后缀)
this.mSquare_kilometer = (1000 * 1000)
this.mHectare = (100 * 100)
this.mSquare_meter = 1
this.mAre = ((10000/15) * this.mSquare_meter)
this.mSquare_decimeter = (0.1 * 0.1)
this.mSquare_centimeter = (0.01 * 0.01)
this.mSquare_millimeter = (0.001 * 0.001)
this.engSquare_foot = (0.3048 * 0.3048)
this.engSquare_yard = (3 * 3 * this.engSquare_foot)
this.usSquare_rod = (16.5 *16.5 * this.engSquare_foot)
this.engAcre = 160 * this.usSquare_rod
this.engSquare_mile = (5280 *5280 * this.engSquare_foot)
this.engSquare_inch = (this.engSquare_foot / (12 * 12))
}//武鸣人网站https://www.wuming.ren 网站很好记住，wuming.ren(武鸣拼音.ren域名后缀)
var area_data = new AREA_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
}//武鸣人网站https://www.wuming.ren 网站很好记住，wuming.ren(武鸣拼音.ren域名后缀)
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;
}//武鸣人网站https://www.wuming.ren 网站很好记住，wuming.ren(武鸣拼音.ren域名后缀)
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; // *** Hack for Opera 4.0 2000-10-14
}
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)
{//武鸣人网站https://www.wuming.ren 网站很好记住，wuming.ren(武鸣拼音.ren域名后缀)
resetValues(form,area_data);
}
//-->
</SCRIPT>
</head>
<body>
<a href="https://www.wuming.ren">武鸣人</a>，各种信息资源免费发布，分享励志语录经典短句，减肥健身常识，各种js特效代码。网站很好记住，wuming.ren(武鸣拼音.ren域名后缀)<hr>
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<script type="text/javascript" src="https://www.wuming.ren/ad/tc.js"></script>
<script type="text/javascript" src="https://www.wuming.ren/ad/a.js"></script>
<TABLE width="100%" border="0" cellPadding=0 cellSpacing=0 class="small">
<TBODY>
<TR>
<TD align="center" valign="top">
<FORM action="">
<br>
<TABLE width="75%" align="center" cellPadding=4 cellSpacing=0 class="small">
<TBODY>
<TR>
<TD colspan="6"> 可实现平方公里(km<SUP>2</SUP>)、公顷(ha)、市亩、平方米(m<SUP>2</SUP>)、平方分米(dm<SUP>2</SUP>)、平方厘米(cm<SUP>2</SUP>)、平方毫米(mm<SUP>2</SUP>)、平方英里(sq mi)、英亩、平方竿(sq rd)、平方码(sq yd)、平方英尺(sq ft)、平方英寸(sq in)间的互转互换。</TD>
</TR>
<TR>
<TD colspan="6"> </TD>
</TR>
<TR>
<TD align=right noWrap>平方公里(km<SUP>2</SUP>)</TD>
<TD align=left><INPUT
name=mSquare_kilometer class="SmallInput" size=15></TD>
<TD align=left><INPUT onclick="if (checkNum(mSquare_kilometer.value)) compute(this.form,mSquare_kilometer.name,area_data)" type=button value=换算 class='SmallButton' name=mSquare_kilometer_bt></TD>
<TD align=right noWrap>公顷(ha)</TD>
<TD align=left><INPUT name=mHectare class="SmallInput" size=15></TD>
<TD align=left><INPUT onclick="if (checkNum(mHectare.value)) compute(this.form,mHectare.name,area_data)" type=button value=换算 class='SmallButton' name=mHectare_bt></TD>
</TR>
<TR>
<TD align=right noWrap>市亩</TD>
<TD align=left><INPUT name=mAre class="SmallInput" size=15></TD>
<TD align=left><INPUT onclick="if (checkNum(mAre.value)) compute(this.form,mAre.name,area_data)" type=button value=换算 class='SmallButton' name=mAre_bt></TD>
<TD align=right noWrap>平方米(m<SUP>2</SUP>)</TD>
<TD align=left><INPUT
name=mSquare_meter class="SmallInput" size=15></TD>
<TD align=left><INPUT onclick="if (checkNum(mSquare_meter.value)) compute(this.form,mSquare_meter.name,area_data)" type=button value=换算 class='SmallButton' name=mSquare_meter_bt></TD>
</TR>
<TR>
<TD align=right noWrap>平方分米(dm<SUP>2</SUP>)</TD>
<TD align=left><INPUT
name=mSquare_decimeter class="SmallInput" size=15></TD>
<TD align=left><INPUT onclick="if (checkNum(mSquare_decimeter.value)) compute(this.form,mSquare_decimeter.name,area_data)" type=button value=换算 class='SmallButton' name=mSquare_decimeter_bt></TD>
<TD align=right noWrap>平方厘米(cm<SUP>2</SUP>)</TD>
<TD align=left><INPUT
name=mSquare_centimeter class="SmallInput" size=15></TD>
<TD align=left><INPUT onclick="if (checkNum(mSquare_centimeter.value)) compute(this.form,mSquare_centimeter.name,area_data)" type=button value=换算 class='SmallButton' name=mSquare_centimeter_bt></TD>
</TR>
<TR>
<TD align=right noWrap>平方毫米(mm<SUP>2</SUP>)</TD>
<TD align=left><INPUT
name=mSquare_millimeter class="SmallInput" size=15></TD>
<TD align=left><INPUT onclick="if (checkNum(mSquare_millimeter.value)) compute(this.form,mSquare_millimeter.name,area_data)" type=button value=换算 class='SmallButton' name=mSquare_millimeter_bt></TD>
<TD align=right noWrap>平方英里(sq mi)</TD>
<TD align=left><INPUT
name=engSquare_mile class="SmallInput" size=15></TD>
<TD align=left><INPUT onclick="if (checkNum(engSquare_mile.value)) compute(this.form,engSquare_mile.name,area_data)" type=button value=换算 class='SmallButton' name=engSquare_mile_bt></TD>
</TR>
<TR>
<TD align=right noWrap>英亩</TD>
<TD align=left><INPUT name=engAcre class="SmallInput" size=15></TD>
<TD align=left><INPUT onclick="if (checkNum(engAcre.value)) compute(this.form,engAcre.name,area_data)" type=button value=换算 class='SmallButton' name=engAcre_bt></TD>
<TD align=right noWrap>平方竿(sq rd)</TD>
<TD align=left><INPUT name=usSquare_rod class="SmallInput" size=15></TD>
<TD align=left><INPUT onclick="if (checkNum(usSquare_rod.value)) compute(this.form,usSquare_rod.name,area_data)" type=button value=换算 class='SmallButton' name=usSquare_rod_bt></TD>
</TR>
<TR>
<TD align=right noWrap>平方码(sq yd)</TD>
<TD align=left><INPUT
name=engSquare_yard class="SmallInput" size=15></TD>
<TD align=left><INPUT onclick="if (checkNum(engSquare_yard.value)) compute(this.form,engSquare_yard.name,area_data)" type=button value=换算 class='SmallButton' name=engSquare_yard_bt></TD>
<TD align=right noWrap>平方英尺(sq ft)</TD>
<TD align=left><INPUT
name=engSquare_foot class="SmallInput" size=15></TD>
<TD align=left><INPUT onclick="if (checkNum(engSquare_foot.value)) compute(this.form,engSquare_foot.name,area_data)" type=button value=换算 class='SmallButton' name=engSquare_foot_bt></TD>
</TR>
<TR>
<TD align=right noWrap>平方英寸(sq in)</TD>
<TD align=left><INPUT
name=engSquare_inch class="SmallInput" size=15></TD>
<TD align=left><INPUT onclick="if (checkNum(engSquare_inch.value)) compute(this.form,engSquare_inch.name,area_data)" type=button value=换算 class='SmallButton' name=engSquare_inch_bt></TD>
<TD colSpan=3></TD>
</TR>
</TBODY>
</TABLE>
<br>
<div align="center">
<INPUT onclick=resetAll(this.form) type=button value=数据重置 class='SmallButton' name=res7>
</div>
</FORM></TD>
</TR>
</TBODY>
</TABLE>
</body>
</html>