长度换算js脚本代码

2016-10-14 网页编程网 网页编程网

<html>
<head>
<meta http-equiv="content-Type" content="text/html;charset=gb2312">
<title>长度换算js脚本</title>
<SCRIPT>
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>
</head>
<body>
<TABLE width="100%" border="0" cellPadding=0 cellSpacing=0  class="small">
  <TBODY>
    <TR>
      <TD align="center" valign="top">
          <FORM action="">
            <br>
            <table width="75%" border="0" cellspacing="0" cellpadding="0" class="small">
              <tr>
                <td>　　可实现公里(km)、米(m)、分米(dm)、厘米(cm)、里、丈、尺、寸、分、厘、海里(nmi)、英寻、英里、弗隆(fur)、码(yd)、英尺(ft)、英寸(in)、毫米(mm)、微米(um)间的互转互换。</td>
              </tr>
            </table>
            <br>
            <TABLE cellSpacing=0 cellPadding=4 width="75%" class="small">
              <TBODY>
                <TR>
                  <TD noWrap align=right>公里(km)</TD>
                  <TD align=left><INPUT size=15 name=mKilometer class="SmallInput"></TD>
                  <TD align=left><INPUT onclick="if (checkNum(mKilometer.value)) compute(this.form,mKilometer.name,length_data)" type=button value=换算  class='SmallButton'  name=mKilometer_bt></TD>
                  <TD noWrap align=right>米(m)</TD>
                  <TD align=left><INPUT size=15 name=mMeter class="SmallInput"></TD>
                  <TD align=left><INPUT onclick="if (checkNum(mMeter.value)) compute(this.form,mMeter.name,length_data)" type=button value=换算  class='SmallButton'  name=mMeter_bt></TD>
                </TR>
                <TR>
                  <TD noWrap align=right>分米(dm)</TD>
                  <TD align=left><INPUT size=15 name=mDecimeter class="SmallInput"></TD>
                  <TD align=left><INPUT onclick="if (checkNum(mDecimeter.value)) compute(this.form,mDecimeter.name,length_data)" type=button value=换算  class='SmallButton'  name=mDecimeter_bt></TD>
                  <TD noWrap align=right>厘米(cm)</TD>
                  <TD align=left><INPUT size=15 name=mCentimeter class="SmallInput"></TD>
                  <TD align=left><INPUT onclick="if (checkNum(mCentimeter.value)) compute(this.form,mCentimeter.name,length_data)" type=button value=换算  class='SmallButton'  name=mCentimeter_bt></TD>
                </TR>
                <TR>
                  <TD noWrap align=right>毫米(mm)</TD>
                  <TD align=left><INPUT size=15 name=mMillimeter class="SmallInput"></TD>
                  <TD align=left><INPUT onclick="if (checkNum(mMillimeter.value)) compute(this.form,mMillimeter.name,length_data)" type=button value=换算  class='SmallButton'  name=mMillimeter_bt></TD>
                  <TD noWrap align=right>微米(um)</TD>
                  <TD align=left><INPUT size=15 name=mMicronmeter class="SmallInput"></TD>
                  <TD align=left><INPUT onclick="if (checkNum(mMicronmeter.value)) compute(this.form,mMicronmeter.name,length_data)" type=button value=换算  class='SmallButton'  name=mMicronmeter_bt></TD>
                </TR>
                <TR>
                  <TD noWrap align=right>里</TD>
                  <TD align=left><INPUT size=15 name=mLimeter class="SmallInput"></TD>
                  <TD align=left><INPUT onclick="if (checkNum(mLimeter.value)) compute(this.form,mLimeter.name,length_data)" type=button value=换算  class='SmallButton'  name=mLimeter_bt></TD>
                  <TD noWrap align=right>丈</TD>
                  <TD align=left><INPUT size=15 name=mZhangmeter class="SmallInput"></TD>
                  <TD align=left><INPUT onclick="if (checkNum(mZhangmeter.value)) compute(this.form,mZhangmeter.name,length_data)" type=button value=换算  class='SmallButton'  name=mZhangmeter_bt></TD>
                </TR>
                <TR>
                  <TD noWrap align=right>尺</TD>
                  <TD align=left><INPUT size=15 name=mChimeter class="SmallInput"></TD>
                  <TD align=left><INPUT onclick="if (checkNum(mChimeter.value)) compute(this.form,mChimeter.name,length_data)" type=button value=换算  class='SmallButton'  name=mChimeter_bt></TD>
                  <TD noWrap align=right>寸</TD>
                  <TD align=left><INPUT size=15 name=mCunmeter class="SmallInput"></TD>
                  <TD align=left><INPUT onclick="if (checkNum(mCunmeter.value)) compute(this.form,mCunmeter.name,length_data)" type=button value=换算  class='SmallButton'  name=mCunmeter_bt></TD>
                </TR>
                <TR>
                  <TD noWrap align=right>分</TD>
                  <TD align=left><INPUT size=15 name=mFenmeter class="SmallInput"></TD>
                  <TD align=left><INPUT onclick="if (checkNum(mFenmeter.value)) compute(this.form,mFenmeter.name,length_data)" type=button value=换算  class='SmallButton'  name=mFenmeter_bt></TD>
                  <TD noWrap align=right>厘</TD>
                  <TD align=left><INPUT size=15 name=mmLimeter class="SmallInput"></TD>
                  <TD align=left><INPUT onclick="if (checkNum(mmLimeter.value)) compute(this.form,mmLimeter.name,length_data)" type=button value=换算  class='SmallButton'  name=mmLimeter_bt></TD>
                </TR>
                <TR>
                  <TD noWrap align=right>海里(nmi)</TD>
                  <TD align=left><INPUT size=15 name=nautMile class="SmallInput"></TD>
                  <TD align=left><INPUT onclick="if (checkNum(nautMile.value)) compute(this.form,nautMile.name,length_data)" type=button value=换算  class='SmallButton'  name=nautMile_bt></TD>
                  <TD noWrap align=right>英寻</TD>
                  <TD align=left><INPUT size=15 name=nautFathom class="SmallInput"></TD>
                  <TD align=left><INPUT onclick="if (checkNum(nautFathom.value)) compute(this.form,nautFathom.name,length_data)" type=button value=换算  class='SmallButton'  name=nautFathom_bt></TD>
                </TR>
                <TR>
                  <TD noWrap align=right>英里(mi)</TD>
                  <TD align=left><INPUT size=15 name=engMile class="SmallInput"></TD>
                  <TD align=left><INPUT onclick="if (checkNum(engMile.value)) compute(this.form,engMile.name,length_data)" type=button value=换算  class='SmallButton'  name=engMile_bt></TD>
                  <TD noWrap align=right>弗隆(fur)</TD>
                  <TD align=left><INPUT size=15 name=engFurlong class="SmallInput"></TD>
                  <TD align=left><INPUT onclick="if (checkNum(engFurlong.value)) compute(this.form,engFurlong.name,length_data)" type=button value=换算  class='SmallButton'  name=engFurlong_bt></TD>
                </TR>
                <TR>
                  <TD noWrap align=right>码(yd)</TD>
                  <TD align=left><INPUT size=15 name=engYard class="SmallInput"></TD>
                  <TD align=left><INPUT onclick="if (checkNum(engYard.value)) compute(this.form,engYard.name,length_data)" type=button value=换算  class='SmallButton'  name=engYard_bt></TD>
                  <TD noWrap align=right>英尺(ft)</TD>
                  <TD align=left><INPUT size=15 name=engFoot class="SmallInput"></TD>
                  <TD align=left><INPUT onclick="if (checkNum(engFoot.value)) compute(this.form,engFoot.name,length_data)" type=button value=换算  class='SmallButton'  name=engFoot_bt></TD>
                </TR>
                <TR>
                  <TD noWrap align=right>英寸(in)</TD>
                  <TD align=left><INPUT size=15 name=engInch class="SmallInput"></TD>
                  <TD align=left><INPUT onclick="if (checkNum(engInch.value)) compute(this.form,engInch.name,length_data)" type=button value=换算  class='SmallButton'  name=engInch_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>

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