Das Beispiel in diesem Artikel stellt den detaillierten Code von Javascript zur Implementierung einer einfachen Taschenrechnerfunktion vor und teilt ihn als Referenz mit Ihnen. Der spezifische Inhalt ist wie folgt
Rendering:
Implementierungscode:
<html> <head> <script> function calc(event){ // test //window.alert(event.value); var val = new String(event.value); // clear space val = val.trim(); var res = document.getElementById("res"); // clear if(val == "clear"){ res.value = ""; } // back if(val == "back"){ res.value = res.value.substring(0, res.value.length - 1); } // power if(val == "power"){ val = "p"; } // add val to text if(val.length == 1 && val != "="){ res.value = res.value + val; } // calc result if(val == "="){ var arr; var result; // power if(res.value.indexOf("p") != -1){ arr = res.value.split("p"); //window.alert(arr); result = Math.pow(parseFloat(arr[0]) ,parseFloat(arr[1])); //window.alert(res); res.value = result; } // plus if(res.value.indexOf("+") != -1){ arr = res.value.split("+"); //window.alert(arr); result = parseFloat(arr[0]) + parseFloat(arr[1]); //window.alert(res); res.value = result; } else if(res.value.indexOf("-") != -1){ // minus arr = res.value.split("-"); //window.alert(arr); result = parseFloat(arr[0]) - parseFloat(arr[1]); //window.alert(res); res.value = result; } else if(res.value.indexOf("*") != -1){ // multiply arr = res.value.split("*"); //window.alert(arr); result = parseFloat(arr[0]) * parseFloat(arr[1]); //window.alert(res); res.value = result; } else if(res.value.indexOf("/") != -1){ // division arr = res.value.split("/"); //window.alert(arr); result = parseFloat(arr[0]) / parseFloat(arr[1]); //window.alert(res); res.value = result; } else if(res.value.indexOf("%") != -1){ // module arr = res.value.split("%"); //window.alert(arr); result = parseFloat(arr[0]) % parseFloat(arr[1]); //window.alert(res); res.value = result; } } } </script> </head> <body> <table border="1px" cellpadding="10px" cellspacing="5px" align="center"> <tr align="center"> <td colspan="4"><input type="text" id="res" size="35px" value="" style="text-align:right;"/></td> </tr> <tr align="center"> <td><input type="button" value="power" onclick="calc(this)"/></td> <td><input type="button" value="clear" onclick="calc(this)"/></td> <td colspan="2"><input type="button" value=" back " onclick="calc(this)"/></td> </tr> <tr align="center"> <td><input type="button" value=" 1 " onclick="calc(this)"/></td> <td><input type="button" value=" 2 " onclick="calc(this)"/></td> <td><input type="button" value=" 3 " onclick="calc(this)"/></td> <td><input type="button" value=" + " onclick="calc(this)"/></td> </tr> <tr align="center"> <td><input type="button" value=" 4 " onclick="calc(this)"/></td> <td><input type="button" value=" 5 " onclick="calc(this)"/></td> <td><input type="button" value=" 6 " onclick="calc(this)"/></td> <td><input type="button" value=" - " onclick="calc(this)"/></td> </tr> <tr align="center"> <td><input type="button" value=" 7 " onclick="calc(this)"/></td> <td><input type="button" value=" 8 " onclick="calc(this)"/></td> <td><input type="button" value=" 9 " onclick="calc(this)"/></td> <td><input type="button" value=" * " onclick="calc(this)"/></td> </tr> <tr align="center"> <td><input type="button" value=" 0 " onclick="calc(this)"/></td> <td><input type="button" value=" = " onclick="calc(this)"/></td> <td><input type="button" value=" % " onclick="calc(this)"/></td> <td><input type="button" value=" / " onclick="calc(this)"/></td> </tr> </table> </body> </html>
Ich hoffe, dass dieser Artikel für alle hilfreich ist, die JavaScript-Programmierung lernen.