一个简单的网页计算器代码

发布时间：2018-08-22 15:02:05 所属栏目：语言来源：站长网

导读：一个简单的网页计算器代码，这是一个主要用来综合学习 Java Script所做的网页计算器，样子大体与JS系统的相差不大，计算器可以进行基础的加减乘除运算。演示： HTMLHEADTITLE计算器/TITLE/HEADBODY bgcolor=#fef4d2 onload=StartCal()brbrcenterh2网页计

　　一个简单的网页计算器代码，这是一个主要用来综合学习JavaScript所做的网页计算器，样子大体与JS系统的相差不大，计算器可以进行基础的加减乘除运算。

　　演示：

<HTML> <HEAD> <TITLE>计算器</TITLE> </HEAD> <BODY bgcolor="#fef4d2" onload=StartCal()> <br><br> <center> <h2>网页计算器</h2> <hr width=300> <script language=JavaScript> var opStack = new Array(4) opStack[0] = 0 opStack[1] = '' opStack[2] = '' opStack[3] = '' function StartCal(){ document.PAD.SUM.value= "0" } function KeyinNum() { if (opStack[0] >= 2) { opStack[0] = 3 } else { opStack[0] = 1 } opStack[opStack[0]] = '' + document.PAD.SUM.value } function resetNum () { opStack[0] = 0 opStack[1] = 0 document.PAD.CAL.value = '' document.PAD.SUM.value = '0' } function calc1 (x) { var opFlag = opStack[0] if (opFlag == -1 || opFlag == 1) { count(x) } else if (opFlag == 3) { opStack[1] = '' + eval(opStack[1] + opStack[2] + opStack[3]) count(x) } } function count (x) { if (x == 'Si') { opStack[1] = '' + Math.sin (opStack[1]) } else if (x == 'aS') { opStack[1] = '' + Math.asin(opStack[1]) } else if (x == 'Co') { opStack[1] = '' + Math.cos (opStack[1]) } else if (x == 'aC') { opStack[1] = '' + Math.acos(opStack[1]) } else if (x == 'Ta') { opStack[1] = '' + Math.tan (opStack[1]) } else if (x == 'aT') { opStack[1] = '' + Math.atan(opStack[1]) } else if (x == '≡') { opStack[1] = '' + Math.pow (opStack[1],.5) } else if (x == '^2') { opStack[1] = '' + Math.pow (opStack[1], 2) } else if (x == '^3') { opStack[1] = '' + Math.pow (opStack[1], 3) } else if (x == '^4') { opStack[1] = '' + Math.pow (opStack[1], 4) } else if (x == 'AB') { opStack[1] = '' + Math.abs (opStack[1]) } else if (x == '∽') { } document.PAD.CAL.value = '' opStack[0] = -1 display() document.PAD.SUM.focus() document.PAD.SUM.select() } function display () { var sum = parseFloat(opStack[1]) document.PAD.SUM.value = '' + Math.round (sum * Math.pow(10,14)) / Math.pow(10,14) } function fra(){ var i var j = 1 var k = document.PAD.SUM.value if (k >= 70) {opStack[1] = 0; document.PAD.SUM.value = "---Error---"; return} for (i = 1; i <= k; i++){j = j * i} opStack[1] = document.PAD.SUM.value = j document.PAD.SUM.focus() document.PAD.SUM.select() } function entry (x) { if (opStack[0] == -1) { opStack[0] = 1; opStack[1] = ''} if (opStack[0] == 0) { opStack[0] = 1; opStack[1] = ''} if (opStack[0] == 2) { opStack[0] = 3; opStack[3] = ''} var result = result = opStack[opStack[0]] if (result == '0') { result = '' } if (x>='1' && x<='9') { result = '' + result + x } else if (x == 'P') { result = '' + Math.PI } else if (x == '0') { if (result != '') result = '' + result + '0' } else if (x == 'B') { if (result != '') result = result.substring(0, result.length - 1) } else if (x == '.') { if (result != '') { if (result.indexOf(".") == -1) result += "." } else { result = '0.' } } if (result =='') result = '0' opStack[opStack[0]] = result document.PAD.SUM.value = result } function calc2 (x) { var opFlag = opStack[0] if (opFlag != 2) { if (opFlag == 3) { opStack[1]=''+eval(opStack[1]+opStack[2]+opStack[3]) display() } opStack[0] = 2 opStack[2] = x document.PAD.CAL.value = x document.PAD.SUM.focus() document.PAD.SUM.select() } } function neg() { if (opStack[0] != 2 && opStack[0] != 0) { opStack[0] = Math.abs(opStack[0]) var result = opStack[opStack[0]] if (result != '0' && result != '') { if (result.charAt(0) == '-') { result = result.substring(1, result.length) } else { result = '-' + result } opStack[opStack[0]] = result document.PAD.SUM.value = result } } } function TurnOff(){ var ask = confirm("您确定要关闭计算器么？") if (ask == true) {window.close()} else {return} } </script> <FORM NAME="PAD"> <TABLE BORDER> <TR><TD COLSPAN=8> <INPUT NAME="CAL" TYPE="TEXT" SIZE=1 VALUE="">结果： <INPUT NAME="SUM" TYPE="TEXT" SIZE=16 VALUE="" onChange="KeyinNum()"> <TR> <TD><INPUT TYPE="BUTTON" VALUE="重置" onClick="resetNum()"> <TD><INPUT TYPE="BUTTON" VALUE="开方" onClick="calc1('≡')"> <TD><INPUT TYPE="BUTTON" VALUE="平方" onClick="calc1('^2')"> <TD><INPUT TYPE="BUTTON" VALUE="X !" onClick="fra()" > <TR> <TD><INPUT TYPE="BUTTON" VALUE=" 7 " onClick="entry('7')"> <TD><INPUT TYPE="BUTTON" VALUE=" 8 " onClick="entry('8')"> <TD><INPUT TYPE="BUTTON" VALUE=" 9 " onClick="entry('9')"> <TD><INPUT TYPE="BUTTON" VALUE=" * " onClick="calc2('*')"> <TR> <TD><INPUT TYPE="BUTTON" VALUE=" 4 " onClick="entry('4')"> <TD><INPUT TYPE="BUTTON" VALUE=" 5 " onClick="entry('5')"> <TD><INPUT TYPE="BUTTON" VALUE=" 6 " onClick="entry('6')"> <TD><INPUT TYPE="BUTTON" VALUE=" / " onClick="calc2('/')"> <TR> <TD><INPUT TYPE="BUTTON" VALUE=" 1 " onClick="entry('1')"> <TD><INPUT TYPE="BUTTON" VALUE=" 2 " onClick="entry('2')"> <TD><INPUT TYPE="BUTTON" VALUE=" 3 " onClick="entry('3')"> <TD><INPUT TYPE="BUTTON" VALUE=" - " onClick="calc2('-')"> <TR> <TD><INPUT TYPE="BUTTON" VALUE=" 0 " onClick="entry('0')"> <TD><INPUT TYPE="BUTTON" VALUE=" . " onClick="entry('.')"> <TD><INPUT TYPE="BUTTON" VALUE="+/-" onClick="neg()" > <TD><INPUT TYPE="BUTTON" VALUE=" + " onClick="calc2('+')"> <TR> <TD><INPUT TYPE="BUTTON" VALUE="关闭" onClick="TurnOff()"> <TD><INPUT TYPE="BUTTON" VALUE="后退" onClick="entry('B')"> <TD><INPUT TYPE="BUTTON" VALUE=" Pi "onClick="entry('P')"> <TD><INPUT TYPE="BUTTON" VALUE=" = " onClick="calc1('=')" > </TABLE> </FORM> </BODY> </HTML><br /><center>如不能显示效果，请按Ctrl+F5刷新本页，更多网页代码：<a href='http://www.veryhuo.com/' target='_blank'>http://www.veryhuo.com/</a></center>
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