計算機

--<form name="calc"> <div align="center"><center><table border="1"> <tr> <td colspan="5"><input type="text" size="14" name="result" value="_" onfocus="blur()"> </td> </tr> <tr> <td><input type="button" name="1" value=" 1 " onclick="input(this.value)"></td> <td><input type="button" name="2" value=" 2 " onclick="input(this.value)"></td> <td><input type="button" name="3" value=" 3 " onclick="input(this.value)"></td> <td><input type="button" name="CE" value=" CE " onclick="clearall()"></td> <td><input type="button" name="C" value="   C  " onclick="clearnow()"></td> </tr> <tr> <td><input type="button" name="4" value=" 4 " onclick="input(this.value)"></td> <td><input type="button" name="5" value=" 5 " onclick="input(this.value)"></td> <td><input type="button" name="6" value=" 6 " onclick="input(this.value)"></td> <td><input type="button" name="sing" value=" +/- " onclick="change()"></td> <td><input type="button" name="=" value="  =   " onclick="operate(this.value)"></td> </tr> <tr> <td><input type="button" name="7" value=" 7 " onclick="input(this.value)"></td> <td><input type="button" name="8" value=" 8 " onclick="input(this.value)"></td> <td><input type="button" name="9" value=" 9 " onclick="input(this.value)"></td> <td><input type="button" name="+" value="  +   " onclick="operate(this.value)"></td> <td><input type="button" name="-" value="   -   " onclick="operate(this.value)"></td> </tr> <tr> <td colspan="2"><input type="button" name="0" value="    0   " onclick="input(this.value)"></td> <td><input type="button" name="." value="  . " onclick="point()"></td> <td><input type="button" name="*" value="   *   " onclick="operate(this.value)"></td> <td><input type="button" name="/" value="   /    " onclick="operate(this.value)"></td> </tr> </table> </center></div> </form> <font color="#FFFFFF"> <script language="JavaScript"> <!-- hide script from old browser var answer=0 var lastvalue=0 var op="+" var lastop="+" var newnumber=true

function input(digit){ if (op=="  =   ") clearall() if ((!newnumber)&&(document.calc.result.value!="0")) document.calc.result.value+=eval(digit) else document.calc.result.value=""+eval(digit) newnumber=false }

function clearnow(){ document.calc.result.value="_" newnumber=true }

function clearall(){ answer=0 lastop="+" op="+" clearnow() }

function operate(operation){ if ((newnumber!=true)||(op=="  =   ")) { answer=""+answer if ((operation!="  =   ") && (op!="  =   ")) { lastvalue=document.calc.result.value lastop=op answer=eval(answer+lastop+lastvalue) document.calc.result.value=answer } else if (operation=="  =   ") { if (op!="  =   ") { lastop=op lastvalue=document.calc.result.value } answer=eval(answer+lastop+lastvalue) document.calc.result.value=answer } newnumber=true } op=operation }

function change(){ answer=-1*document.calc.result.value document.calc.result.value=answer }

function point(){ if (!newnumber) { number=document.calc.result.value if (number.indexOf('.')==-1) document.calc.result.value+="." } } // end hiding  --> </script></font> --

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