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HTML 

              
                
<div id="app" class="calculator">
  <div class="calc-body">
    <div class="calc-body-screen">
      <div class="q"><span id="inputtile">{{caltext}}</span></div>
      <div class="a"><span id="answertile">{{ans}}</span></div>
    </div>
    <div class="calc-body-btn"><span>MC</span></div>
    <div class="calc-body-btn"><span>MR</span></div>
    <div class="calc-body-btn"><span>MS</span></div>
    <div class="calc-body-btn"><span>M+</span></div>
    <div class="calc-body-btn"><span>M-</span></div>
    <div id="btn_back" class="calc-body-btn"><span>←</span></div>
    <div id="btn_clear_all" class="calc-body-btn"><span>CE</span></div>
    <div id="btn_clear" class="calc-body-btn"><span>C</span></div>
    <div id="btn_rvnag" class="calc-body-btn"><span>±</span></div>
    <div id="btn_sqrt" class="calc-body-btn"><span>√</span></div>
    <div class="calc-body-btn btnnum"><span>7</span></div>
    <div class="calc-body-btn btnnum"><span>8</span></div>
    <div class="calc-body-btn btnnum"><span>9</span></div>
    <div class="calc-body-btn btnnum"><span>/</span></div>
    <div class="calc-body-btn btnnum"><span>%</span></div>
    <div class="calc-body-btn btnnum"><span>4</span></div>
    <div class="calc-body-btn btnnum"><span>5</span></div>
    <div class="calc-body-btn btnnum"><span>6</span></div>
    <div class="calc-body-btn btnnum"><span>＊</span></div>
    <div id="btn_reverse" class="calc-body-btn"><span>1/x</span></div>
    <div class="left">
      <div class="calc-body-btn btnnum"><span>1</span></div>
      <div class="calc-body-btn btnnum"><span>2</span></div>
      <div class="calc-body-btn btnnum"><span>3</span></div>
      <div class="calc-body-btn btnnum"><span>-</span></div>
      <div class="calc-body-btn zero btnnum"><span>0</span></div>
      <div class="calc-body-btn btnnum"><span>.</span></div>
      <div class="calc-body-btn btnnum"><span>+</span></div>
    </div>
    <div id="btn_cal_all" class="calc-body-btn qu"><span>=</span></div>
  </div>
</div>
!

CSS 

              
                	html,body {
		width: 100%;
		height: 100%;
		padding: 0;
		margin: 0;
	}
	.calculator {
		width: 100%;
		height: 100%;
		min-height: 600px;
		background-image: linear-gradient(to bottom, #038FA1, #023E6E);
		display: flex;
		justify-content: center;
		align-items: center;
	}
	.calc-body {
	  width: 85%;
	  max-width: 250px;
	  height: 375px;
	  background-image: linear-gradient(to bottom, #004D59, #012024);
	  padding: 10px;
	  border-radius: 10px;
	  box-shadow: 0 25px 35px -15px rgba(3, 28, 31, .85);
	  /*flex*/
	  display: flex;
	  flex-wrap: wrap;
	  justify-content: space-between;
	  align-items: stretch;
	  align-content: space-between;
	}
	.calc-body-screen {
		flex: 1 0 100%;
		height: 24%;
		color: #A8EEFF;
		box-shadow: inset 0 0 0 1px #225861;
		display: flex;
		flex-direction: column;
		justify-content: space-between;
		text-align: right;
	}
	.calc-body-screen .q {
		width: 100%;
		line-height: 40px;
		padding: 0 5%;
		box-sizing: border-box;
		font-size: 15px;
	}
	.calc-body-screen .a {
		line-height: 50px;
		width: 100%;
		padding: 0 5%;
		box-sizing: border-box;
		font-size: 38px;
	}
	.calc-body-btn {
		cursor: pointer;
		opacity: .6;
		font-size: 12px;
		flex: 0 1 18%;
		height: 11%;
		color: #A8EEFF;
		box-shadow: inset 0 0 0 1px #225861;
		text-align: center;
		border-radius: 5px;
		display: flex;
		justify-content: center;
		align-items: center;
	}
	.calc-body-btn:hover {
		background-color: #225861;
	}
	.calc-body-btn.qu {
		height: 23%;
	}
	.left {
		display: flex;
		flex: 0 0 79.5%;
		height: 23%;
		align-content: space-between;
		justify-content: space-between;
		flex-wrap: wrap;
	}
	.left .calc-body-btn {
		height: 46%;
		flex: 0 0 23%;
	}
	.left .calc-body-btn.zero {
		flex: 0 1 48.5%;
	}
!

JS 

              
                var global_cal={};
//計算式
global_cal.caltext="";
//答案
global_cal.ans=0;
var lastcal=false;


//將計算式 答案資料與介面同步
var vm = new Vue({
  el: "#app",
  data: global_cal
});

$(".btnnum").click(function(){
  //當有這個class的時候，計算式直接加上span裡面的文字
  global_cal.caltext+=$(this).children("span").text();
  lastcal=false;
});

//取倒數
$("#btn_reverse").click(function(){
  //計算 並把計算式設為空字串
  global_cal.ans=(""+(1/parseInt(global_cal.caltext))).substr(0,9);
  global_cal.caltext="";
});

//開根號
$("#btn_sqrt").click(function(){
  //如果剛剛做完運算(lastcal=true)就再做一次
  if (lastcal)
    global_cal.ans=(""+(Math.sqrt(parseInt(global_cal.ans)))).substr(0,9);   
  else
    global_cal.ans=(""+(Math.sqrt(parseInt(global_cal.caltext)))).substr(0,9);
  
  global_cal.caltext="";
  lastcal=true;
 
});

$("#btn_rvnag").click(function(){
  //取前九個
  global_cal.ans=(""+(-(parseInt(global_cal.caltext)))).substr(0,9);
  global_cal.caltext="";
});

$("#btn_clear_all").click(function(){
  global_cal.ans=0;
  global_cal.caltext="";
});
$("#btn_clear").click(function(){
  global_cal.caltext="";
});
$("#btn_cal_all").click(function(){
  //丟eval計算取前九個，加""之後資料會變文字，取前九個字
  global_cal.ans=(""+eval(global_cal.caltext.split("＊").join("*"))).substr(0,9);
  global_cal.caltext="";
  lastcal=true;
});

$("#btn_back").click(function(){
  //從0開始取(長度-1)個字，所以看起來像退格
  global_cal.caltext=global_cal.caltext.substr(0,global_cal.caltext.length-1);
});
!
999px

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