保留小数位数的函数--js

控制保留几位有效小数的js函数

//Code CreateBy abandonship 2007.03.12
function FormatAfterDotNumber(ValueString, nAfterDotNum)
{
var ValueString,nAfterDotNum ;
  var resultStr,nTen;
  ValueString = ""+ValueString+"";
  strLen = ValueString.length;
  dotPos = ValueString.indexOf(".",0);
  if (dotPos == -1)
{
    resultStr = ValueString+".";
    for (i=0;i<nAfterDotNum ;i++)
{
      resultStr = resultStr+"0";
   }
    return resultStr;
  }
  else
{
    if ((strLen - dotPos - 1) >= nAfterDotNum ){
      nAfter = dotPos + nAfterDotNum + 1;
      nTen =1;
      for(j=0;j<nAfterDotNum ;j++){
        nTen = nTen*10;
      }
      resultStr = Math.round(parseFloat(ValueString)*nTen)/nTen;
      return resultStr;
    }
    else{
      resultStr = ValueString;
      for (i=0;i<(nAfterDotNum - strLen + dotPos + 1);i++){
        resultStr = resultStr+"0";
      }
      return resultStr;
    }
  }
}

应用时只需要FormatAfterDotNumber( '数字字符串', 保留小数位数);
for example:

<html>
<head>
<SCRIPT LANGUAGE="JAVAscript">
<!--调用上面的函数 -->
</script>
</head>
<body>
<input type="text" name="strTemp">
<input type="button" onclick="alert( FormatAfterDotNumber( document.all.strTemp.value), 保留小数位)" >
</body>
</html>

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