<html> <head> <title>计算器</title> </head> <body bgcolor="#ffffff" onload="FKeyPad.ReadOut.focus();FKeyPad.ReadOut.select();"> <FORM name="Keypad" action=""> <TABLE align="center"> <B> <TABLE align="center" border=2 width=50 height=60 cellpadding=1 cellspacing=5> <TR> <TD colspan=3 align=middle><input name="ReadOut" type="Text" onkeypress="CheckOut()" size=24 value="0" width=100%></TD> <TD></TD> <TD><input name="btnClear" type="Button" value=" C " onclick="Clear()"></TD> <TD><input name="btnClearEntry" type="Button" value=" CE " onclick="ClearEntry()"></TD> </TR> <TR> <TD><input name="btnSeven" type="Button" value=" 7 " onclick="NumPressed(7)"></TD> <TD><input name="btnEight" type="Button" value=" 8 " onclick="NumPressed(8)"></TD> <TD><input name="btnNine" type="Button" value=" 9 " onclick="NumPressed(9)"></TD> <TD></TD> <TD><input name="btnNeg" type="Button" value=" +/- " onclick="Neg()"></TD> <TD><input name="btnPercent" type="Button" value=" % " onclick="Percent()"></TD> </TR> <TR> <TD><input name="btnFour" type="Button" value=" 4 " onclick="NumPressed(4)"></TD> <TD><input name="btnFive" type="Button" value=" 5 " onclick="NumPressed(5)"></TD> <TD><input name="btnSix" type="Button" value=" 6 " onclick="NumPressed(6)"></TD> <TD></TD> <TD align=middle><input name="btnPlus" type="Button" value=" + " onclick="Operation('+')"> </TD> <TD align=middle><input name="btnMinus" type="Button" value=" - " onclick="Operation('-')"></TD> </TR> <TR> <TD><input name="btnOne" type="Button" value=" 1 " onclick="NumPressed(1)"></TD> <TD><input name="btnTwo" type="Button" value=" 2 " onclick="NumPressed(2)"></TD> <TD><input name="btnThree" type="Button" value=" 3 " onclick="NumPressed(3)"></TD> <TD></TD> <TD align=middle><input name="btnMultiply" type="Button" value=" * " onclick="Operation('*')"></TD> <TD align=middle><input name="btnDivide" type="Button" value=" / " onclick="Operation('/')"></TD> </TR> <TR> <TD><input name="btnZero" type="Button" value=" 0 " onclick="NumPressed(0)"></TD> <TD><input name="btnDecimal" type="Button" value=" . " onclick="Decimal()"></TD> <TD colspan=2></TD> <TD><input name="btnEquals" type="Button" value=" = " onclick="Operation('=')"></TD> <TD><input name="btnReturn" type="Button" value="返 回" onclick="goReturn()"></TD> </TR> </TABLE> </TABLE> </B> </FORM> </CENTER> <font face="Verdana, Arial, Helvetica" size=2> <SCRIPT LANGUAGE="JavaScript"> <!-- Begin var FKeyPad = document.forms['Keypad']; var Accum = "0"; var FlagNewNum = false; var PendingOp = "";//=============================================================================== //[描述] 浮点数精确计算 //[参数] str1 - 第一个数 // str2 - 第二个数 // type - 运算符 // precision - 小数位精度 //[调用方式] longCount(str1,str2,type,precision); //[返回值] 计算结果 //=============================================================================== function longCount(str1,str2,type) { var comma1 = 0; if (str1.indexOf(".")!=-1) { str1 = str1.replace(/0*$/,""); comma1 = str1.length - str1.indexOf(".")-1; } var comma2 = 0; if (str2.indexOf(".")!=-1) { str2 = str2.replace(/0*$/,""); comma2 = str2.length - str2.indexOf(".")-1; } str1 = str1.replace(/\./,""); str2 = str2.replace(/\./,""); var value,comma; if (type!="*") { if (comma1>comma2) { for (var i=0;i<comma1-comma2;i++) str2 += "0"; comma = (type=="/")?0:comma1; }else { for (var i=0;i<comma2-comma1;i++) str1 += "0"; comma = (type=="/")?0:comma2; } }else { comma = comma1 + comma2; } if (type=="+") { value = parseInt(str1,10) + parseInt(str2,10); }else if (type=="-") { value = parseInt(str1,10) - parseInt(str2,10); }else if (type=="*") { value = parseInt(str1,10) * parseInt(str2,10); }else if (type=="/") { value = parseInt(str1,10) / parseInt(str2,10); } value = String(value); if (comma>0) value = value.substring(0,value.length-comma)+"."+value.substring(value.length-comma,value.length); if (value.indexOf(".")!=-1) value = value.replace(/0*$/,""); return value; } function NumPressed (Num) { if (FlagNewNum) { FKeyPad.ReadOut.value = Num; FlagNewNum = false; } else { if (FKeyPad.ReadOut.value == "0") FKeyPad.ReadOut.value = Num; else FKeyPad.ReadOut.value += Num; } } function Operation (Op) { var Readout = FKeyPad.ReadOut.value; if (FlagNewNum && PendingOp != "="); else { FlagNewNum = true; if ( '+' == PendingOp || '-' == PendingOp || '/' == PendingOp || '*' == PendingOp) Accum = longCount(Accum,Readout,PendingOp); else Accum = Readout; FKeyPad.ReadOut.value = Accum; PendingOp = Op; FKeyPad.ReadOut.focus(); FKeyPad.ReadOut.select(); } } function Decimal () { var curReadOut = FKeyPad.ReadOut.value; if (FlagNewNum) { curReadOut = "0."; FlagNewNum = false; } else { if (curReadOut.indexOf(".") == -1) curReadOut += "."; } FKeyPad.ReadOut.value = curReadOut; } function ClearEntry () { FKeyPad.ReadOut.value = "0"; FlagNewNum = true; } function Clear () { Accum = "0"; PendingOp = ""; ClearEntry(); } function Neg () { alert(FKeyPad.ReadOut.value); FKeyPad.ReadOut.value = longCount(FKeyPad.ReadOut.value,"-1","*"); } function Percent () { FKeyPad.ReadOut.value = longCount(FKeyPad.ReadOut.value,Accum,"*"); FKeyPad.ReadOut.value = longCount(FKeyPad.ReadOut.value,100,"/"); } function goReturn() { top.returnValue = FKeyPad.ReadOut.value; self.close(); } function CheckOut() { var keyCode = window.event.keyCode; if (keyCode>=48 && keyCode<=57) { if (FlagNewNum) { FKeyPad.ReadOut.value = ""; //window.event.keyCode = null; FlagNewNum = false; } return true; }else if (keyCode==43 || keyCode==45 || keyCode==42 || keyCode==47 || keyCode==61) { Operation(String.fromCharCode(keyCode)); }else if (keyCode==46) {//. if (FKeyPad.ReadOut.value.indexOf(".") == -1) return true; }else if (keyCode==13) goReturn(); window.event.returnValue = false; return false; } // End --> </SCRIPT> </body> </html>
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