javascript white concise calculator_javascript skills

The calculator code in this article is very simple, and you can easily apply this web page effect to your project.

HTML

First we place an input box and multiple calculator buttons on the web page.

<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

Perform corresponding operations according to the operation type:

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; 
    } 
 
  } 
}

The above is the entire content of this article, I hope you all like it.