新手问题，求帮忙解答

2010-09-19 03:23:00 192 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

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<SCRIPT LANGUAGE="JavaScript">

<!-- Begin

var FKeyPad = document.Keypad;

var Accum = 0;

var FlagNewNum = false;

var PendingOp = "";

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 )

Accum += parseFloat(Readout);

else if ( '-' == PendingOp )

Accum -= parseFloat(Readout);

else if ( '/' == PendingOp )

Accum /= parseFloat(Readout);

else if ( '*' == PendingOp )

Accum *= parseFloat(Readout);

else

Accum = parseFloat(Readout);

FKeyPad.ReadOut.value = Accum;

PendingOp = Op;

   }

}

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 () {

FKeyPad.ReadOut.value = parseFloat(FKeyPad.ReadOut.value) * -1;

}

function Percent () {

FKeyPad.ReadOut.value = (parseFloat(FKeyPad.ReadOut.value) / 100) * parseFloat(Accum);

}

// End -->

</SCRIPT>

这是一个计算器的例子，我想问if (FlagNewNum) {
FKeyPad.ReadOut.value = Num;
FlagNewNum = false;
}
这段不就是给FKeyPad.ReadOut.value赋值吗，为什么要判断FlagNewNum 呢？我把这段重新写了下

<script type="text/javascript">

	var FKeyPad = document.Keypad;

		function NumPressed (Num) {

		FKeyPad.ReadOut.value  = Num;

		if (FKeyPad.ReadOut.value == "0")

			{

				FKeyPad.ReadOut.value = Num;

			}

		else

			{

				FKeyPad.ReadOut.value = FKeyPad.ReadOut.value + Num;

			}

   

			}

</script>