Melaksanakan fungsi kalkulator mudah berdasarkan kemahiran javascript

Melaksanakan fungsi kalkulator mudah berdasarkan kemahiran javascript_javascript

WBOY

Lepaskan： 2016-05-16 15:22:15

asal

1178 orang telah melayarinya

Contoh dalam artikel ini memperkenalkan kod javascript terperinci untuk melaksanakan fungsi kalkulator mudah, dan berkongsi dengan anda untuk rujukan anda Kandungan khusus adalah seperti berikut

Rendering:

Kod pelaksanaan:

<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>

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