怎样通过javascript 制作一个 计算器页面，并且实现简单的功能 ...
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=gbk" /> <title>JavaScript计算器</title> </head> <script language="JavaScript"> var baseoper; var digitstate; var num1; var operstate; function setStartState() { digitstate="beempty"; num1=0; baseoper="beempty"; operstate=false; } function add(i) { if(operstate) { cal.total.value=i; operstate=false; } else { if(cal.total.value=="0") { cal.total.value=i; digistate="bein"; } else cal.total.value+=i; } } function cleartext() { cal.total.value="0"; digitstate="beempty"; basestate="beempty" } function count() { if(baseoper!="beempty") { switch(baseoper) { case"+": num1=parseFloat(num1)+parseFloat(cal.total.value); break; case"-": num1=parseFloat(num1)-parseFloat(cal.total.value); break; case"*": num1=parseFloat(num1)*parseFloat(cal.total.value); break; case"/": num1=parseFloat(num1)/parseFloat(cal.total.value); break; } preoper=true; cal.total.value=num1; } baseoper="beempty"; } function useFunc(func) { switch(func) { case"sin": cal.total.value=Math.sin(cal.total.value); break; case"cos": cal.total.value=Math.cos(cal.total.value); break; case"asin": cal.total.value=Math.asin(cal.total.value); break; case"acos": cal.total.value=Math.acos(cal.total.value); break; case"tan": cal.total.value=Math.tan(cal.total.value); break; case"atan": cal.total.value=Math.atan(cal.total.value); break; case"log": cal.total.value=Math.log(cal.total.value); break; case"exp": cal.total.value=Math.exp(cal.total.value); break; case"sqrt": cal.total.value=Math.sqrt(cal.total.value); break; case"1/x": cal.total.value=1/cal.total.value; break; } operstate=true; } function addPoint() { if(digitstate=="bein"||digitstate=="beempty") { cal.total.value+="."; digistate="befloat"; } } function setOper(oper) { operstate=true; if(baseoper=="beempty") { num1=0+cal.total.value; baseoper=oper; } else { count(); baseoper=oper; } } </script> <body onload="setStartState()"> <font size=6> JavaScript计算器</font> <!--计算器界面--------计算器界面--> <form name="cal"> <table border="5" align="left" bordercolor="#FFCCFF"> <tr align="center"> <td colspan="6"> <input type="Text" name="total" size="25" value="0"> </td> </tr> <tr align="center"> <td><input type="Button" value="sin" onclick="useFunc('sin')"></td> <td><input type="Button" value="cos" onclick="useFunc('cos')"></td> <td><input type="Button" value="1" onclick="add('1')"></td> <td><input type="Button" value="2" onclick="add('2')"></td> <td><input type="Button" value="3" onclick="add('3')"></td> <td><input type="Button" value="+" onclick="setOper('+')"></td> </tr> <tr align="center"> <td><input type="Button" value="asin" onclick="useFunc('asin')"></td> <td><input type="Button" value="acos" onclick="useFunc('acos')"></td> <td><input type="Button" value="4" onclick="add('4')"></td> <td><input type="Button" value="5" onclick="add('5')"></td> <td><input type="Button" value="6" onclick="add('6')"></td> <td><input type="Button" value="-" onclick="setOper('-')"></td> </tr> <tr align="center"> <td><input type="Button" value="tan" onclick="useFunc('tan')"></td> <td><input type="Button" value="atan" onclick="useFunc('atan')"></td> <td><input type="Button" value="7" onclick="add('7')"></td> <td><input type="Button" value="8" onclick="add('8')"></td> <td><input type="Button" value="9" onclick="add('9')"></td> <td><input type="Button" value="*" onclick="setOper('*')"></td> </tr> <tr align="center"> <td><input type="Button" value="log" onclick="useFunc('log')"></td> <td><input type="Button" value="exp" onclick="useFunc('exp')"></td> <td><input type="Button" value="0" onclick="add('0')"></td> <td><input type="Button" value="." onclick="addPoint()"></td> <td><input type="Button" value="=" onclick="count()"></td> <td><input type="Button" value="/" onclick="setOper('/')"></td> </tr> <tr align="center"> <td><input type="Button" value="sqrt" onclick="useFunc('sqrt')"> <td><input type="Button" value="1/x" onclick="useFunc('1/x')"> <td><input type="Button" value="pi" onclick="cal.total.value=Math.PI"></td> <td><input type="Button" value="E" onclick="cal.total.value=Math.E"></td> <td colspan=2><input type="Button" value="清除" onclick="cleartext()"></td> </tr> </table> </form> </body> </html>