Javascript weiß Prägnanter Rechner_Javascript-Kenntnisse

Der Rechnercode in diesem Artikel ist sehr einfach und Sie können diesen Webseiteneffekt problemlos auf Ihr Projekt anwenden.

HTML

Zuerst platzieren wir ein Eingabefeld und mehrere Rechnerschaltflächen auf der Webseite.

<div id="calcuator"> 
  <input type="text" id="input-box" value="0" size="21" maxlength="21" readonly="readonly" /> 
  <div id="btn-list"> 
    <div onclick="operator('clear')" class=" btn-30 btn-radius color-red clear-marginleft"> 
      C</div> 
    <div onclick="operator('opposite')" class=" btn-30 btn-radius color-blue"> 
      +/-</div> 
    <div onclick="operator('percent')" class=" btn-30 btn-radius color-blue"> 
      %</div> 
    <div onclick="operator('backspace')" class=" btn-70 btn-radius color-red font-14"> 
      ←</div> 
    <div onclick="typetoinput('7')" class=" btn-30 btn-radius clear-marginleft"> 
      7</div> 
    <div onclick="typetoinput('8')" class=" btn-30 btn-radius"> 
      8</div> 
    <div onclick="typetoinput('9')" class=" btn-30 btn-radius"> 
      9</div> 
    <div onclick="operator('plus')" class=" btn-30 btn-radius color-blue font-14"> 
      +</div> 
    <div onclick="operator('minus')" class=" btn-30 btn-radius color-blue font-14"> 
      -</div> 
    <div onclick="typetoinput('4')" class=" btn-30 btn-radius clear-marginleft"> 
      4</div> 
    <div onclick="typetoinput('5')" class=" btn-30 btn-radius"> 
      5</div> 
    <div onclick="typetoinput('6')" class=" btn-30 btn-radius"> 
      6</div> 
    <div onclick="operator('multiply')" class=" btn-30 btn-radius color-blue font-14"> 
      ×</div> 
    <div onclick="operator('divide')" class=" btn-30 btn-radius color-blue font-12"> 
      ÷</div> 
    <div onclick="typetoinput('1')" class=" btn-30 btn-radius clear-marginleft"> 
      1</div> 
    <div onclick="typetoinput('2')" class=" btn-30 btn-radius"> 
      2</div> 
    <div onclick="typetoinput('3')" class=" btn-30 btn-radius"> 
      3</div> 
    <div onclick="operator('pow')" class=" btn-30 btn-radius color-blue font-14"> 
      ×&sup2;</div> 
    <div onclick="operator('sqrt')" class=" btn-30 btn-radius color-blue font-12"> 
      √</div> 
    <div onclick="typetoinput('0')" class=" btn-70 btn-radius clear-marginleft"> 
      0</div> 
    <div onclick="typetoinput('.')" class=" btn-30 btn-radius"> 
      .</div> 
    <div onclick="operator('result')" class=" btn-70 btn-radius color-red font-14"> 
      =</div> 
  </div> 
</div>

js

Führen Sie entsprechende Vorgänge entsprechend dem Vorgangstyp aus:

function operator(type) { 
  switch (type) { 
  case "clear": 
    input.value = "0"; 
    _string.length = 0; 
    /*document.getElementById("ccc").innerHTML=""; 
        for(i=0;i<_string.length;i++) 
        { 
          document.getElementById("ccc").innerHTML+=_string[i]+" "     
        }*/ 
    break; 
  case "backspace": 
    if (checknum(input.value) != 0) { 
      input.value = input.value.replace(/.$/, ''); 
      if (input.value == "") { 
        input.value = "0"; 
      } 
    } 
    break; 
  case "opposite": 
    if (checknum(input.value) != 0) { 
      input.value = -input.value; 
    } 
    break; 
  case "percent": 
    if (checknum(input.value) != 0) { 
      input.value = input.value / 100; 
    } 
    break; 
  case "pow": 
    if (checknum(input.value) != 0) { 
      input.value = Math.pow(input.value, 2); 
    } 
    break; 
  case "sqrt": 
    if (checknum(input.value) != 0) { 
      input.value = Math.sqrt(input.value); 
    } 
    break; 
  case "plus": 
    if (checknum(input.value) != 0) { 
      _string.push(input.value); 
      _type = "plus"input.value = "+"; 
      input.name = "type"; 
    } 
    break; 
  case "minus": 
    if (checknum(input.value) != 0) { 
      _string.push(input.value); 
      _type = "minus"input.value = "-"; 
      input.name = "type"; 
    } 
    break; 
  case "multiply": 
    if (checknum(input.value) != 0) { 
      _string.push(input.value); 
      _type = "multiply"input.value = "×"; 
      input.name = "type"; 
    } 
    break; 
  case "divide": 
    if (checknum(input.value) != 0) { 
      _string.push(input.value); 
      _type = "divide"input.value = "÷"; 
      input.name = "type"; 
    } 
    break; 
  case "result": 
    if (checknum(input.value) != 0) { 
      _string.push(input.value); 
      if (parseInt(_string.length) % 2 != 0) { 
        _string.push(_string[_string.length - 2]) 
      } 
      if (_type == "plus") { 
        input.value = parseFloat(result(_string)[0]) + parseFloat(result(_string)[1]); 
        input.name = "type" 
      } else if (_type == "minus") { 
        input.value = parseFloat(result(_string)[0]) - parseFloat(result(_string)[1]); 
        input.name = "type" 
      } else if (_type == "multiply") { 
        input.value = parseFloat(result(_string)[0]) * parseFloat(result(_string)[1]); 
        input.name = "type" 
      } else if (_type == "divide") { 
        input.value = parseFloat(result(_string)[0]) / parseFloat(result(_string)[1]); 
        input.name = "type" 
      } 
      break; 
    } 
 
  } 
}

Das Obige ist der gesamte Inhalt dieses Artikels. Ich hoffe, er gefällt Ihnen allen.