本文实例讲述了Vue.js实现的计算器功能。分享给大家供大家参考，具体如下：
1. HTML部分代码
<!DOCTYPE html>
<html lang="en">
<head>
<link rel="stylesheet" type="text/css" href="css/css.css" rel="external nofollow" >
<script type="text/javascript" src="https://cdn.bootcss.com/vue/2.5.16/vue.min.js"></script>
<meta charset="UTF-8">
<title>my-calculator</title>
</head>
<body>
<div id="calculator">
<!--显示框-->
<input-box v-bind:input-show="inputShow">
</input-box>
<btn-list>
<div @click="clearValue()" class=" btn-30 btn-radius color-red clear-marginleft">C</div>
<div class=" btn-30 btn-radius color-blue">+/-</div>
<div @click="inputValue('%')" class=" btn-30 btn-radius color-blue">%</div>
<div @click="backValue()" class=" btn-70 btn-radius color-red font-14">←</div>
<div @click="inputValue('7')" class=" btn-30 btn-radius clear-marginleft">7</div>
<div @click="inputValue('8')" class=" btn-30 btn-radius">8</div>
<div @click="inputValue('9')" class=" btn-30 btn-radius">9</div>
<div @click="squareValue()" class=" btn-30 btn-radius color-blue font-14">ײ</div>
<div @click="radicalValue()" class=" btn-30 btn-radius color-blue font-12">√</div>
<div @click="inputValue('4')" class=" btn-30 btn-radius clear-marginleft">4</div>
<div @click="inputValue('5')" class=" btn-30 btn-radius">5</div>
<div @click="inputValue('6')" class=" btn-30 btn-radius">6</div>
<div @click="inputValue('×')" class=" btn-30 btn-radius color-blue font-14">×</div>
<div @click="inputValue('÷')" class=" btn-30 btn-radius color-blue font-12">÷</div>
<div @click="inputValue('1')" class=" btn-30 btn-radius clear-marginleft">1</div>
<div @click="inputValue('2')" class=" btn-30 btn-radius">2</div>
<div @click="inputValue('3')" class=" btn-30 btn-radius">3</div>
<div @click="inputValue('+')" class=" btn-30 btn-radius color-blue font-14">+</div>
<div @click="inputValue('-')" class=" btn-30 btn-radius color-blue font-14">-</div>
<div @click="inputValue('0')" class=" btn-70 btn-radius clear-marginleft">0</div>
<div @click="inputValue('.')" class=" btn-30 btn-radius">.</div>
<div @click="calValue()" class=" btn-70 btn-radius color-red font-14">=</div>
</btn-list>
</div>
<script>
var calculator = new Vue({
el:'#calculator',
data:{
inputShow:{
value:'0'
}
},
components:{
'input-box':{
props:['inputShow'],
computed: {
value:function () {
return this.inputShow.value
}
},
template:'<input id="input-box" type="text" size="21" maxlength="21" v-model="value" readonly="readonly">'
},
'btn-list':{
template:'<div id="btn-list"><slot></slot></div>'
}
},
methods:{
inputValue(param){
if(Object.prototype.toString.call(this.inputShow.value) == "[object Number]"){ //判断输入框内容是否为数字类型
this.inputShow.value = "0"; //数字类型说明是上个计算结果,清空内容
}
var str ='' + this.inputShow.value; //输入内容时,将输入框内容转为字符串类型
var len = str.length;
var arr = ["+","-","×","÷"];
var num = (''+parseFloat(str.split('').reverse().join(''))).split('').reverse().join(''); //parseInt(str.split('').reverse().join('')))是获取输入框内最后一串数字,再反转回来 ,num为输入框内最后一串数字
var nlen = num.length;
if((num!= '0' && param != '.')|| (param == '.'&& num.indexOf(".")==-1)){ //输入框内最后一串数字不为0时拼接字符串
if(arr.indexOf(str.charAt(len-1)) != -1 && arr.indexOf(param) != -1){ //若一开始输入内容为运算符,输入无效
return;
}
this.inputShow.value += param; //拼接输入内容
}else{
arr.push("%");
if(param == '.'){ //若num中已有小数点,输入内容为小数点,视为无效
return;
}else if(!(arr.indexOf(param) != -1)){ //判断输入框内最后一个字符不为运算符
this.inputShow.value =str.substring(0,str.length-nlen) + param; //输入框内最后一串数字为0时,删除0拼接
}
}
},
clearValue(){ //清空输入框内容
this.inputShow.value = '0';
},
calValue(){ //计算结果
var str = this.inputShow.value;
str = str.replace('×','*').replace('÷','/').replace('%','*0.01'); //替换运算符
try{
this.inputShow.value = eval(str); //若用户输入内容不符合运算规则,不计算
}catch(error){
return;
}
},
squareValue(){ //平方计算
var str = this.inputShow.value;
this.inputShow.value = Math.pow(eval(str),2)
},
radicalValue(){ //开根号计算
var str = this.inputShow.value;
this.inputShow.value = Math.sqrt(eval(str));
},
backValue(){ //删除键,删除单个字符
var str = this.inputShow.value;
if(str.length == 1){
this.inputShow.value = "0";
}else{
this.inputShow.value = str.slice(0,str.length-1);
}
},
/*oppositeValue(){ //正负号取值
var str = this.inputShow.value;
var num = (''+parseInt(str.split('').reverse().join(''))).split('').reverse().join(''); //获取输入框内最后遗传数字
var nlen = num.length;
debugger;
if(!isNaN( parseInt(str.charAt(str.length-1))) && num != 0){ //当输入框末位字符为数字且最后一串数字不为0时,取正负
this.inputShow.value = str.substring(0,str.length-nlen)+`(-${num})`;
}
}*/
}
})
</script>
</body>
</html>
2. CSS部分代码
@charset "utf-8";
body, ul, dl, dd, dt, ol, li, p, h1, h2, h3, h4, h5, h6, textarea, form, select, fieldset, table, td, div, input{margin:0;padding:0;-webkit-text-size-adjust:none}
h1, h2, h3, h4, h5, h6{font-size:12px;font-weight:normal}
body>div{margin:0 auto}
div{text-align:left}
a img{border:0}
body{color:#333;text-align:center;font:12px "微软雅黑";}
ul, ol, li{list-style-type:none;vertical-align:0}
a{outline-style:none;color:#535353;text-decoration:none}
a:hover{color:#D40000;text-decoration:none}
.clear{height:0;overflow:hidden;clear:both}
/* calculator */
#calculator{width:200px;height:245px;padding:10px;border:1px solid #e5e5e5;background:#f8f8f8;-moz-border-radius:3px;-webkit-border-radius:3px;border-radius:3px;box-shadow:0px 0px 10px #f2f2f2;-moz-box-shadow:0px 0px 10px #f2f2f2;-webkit-box-shadow:0px 0px 10px #f2f2f2;margin:40px auto 0 auto;}
#calculator #input-box{margin:0;width:187px;padding:9px 5px;height:14px;border:1px solid #e5e5e5;border-radius:3px;-webkit-border-radius:3px;-moz-border-radius:3px;background:#FFF;text-align:right;line-height:14px;font-size:12px;font-family:Verdana, Geneva, sans-serif;color:#666;outline:none; text-transform:uppercase;}
#calculator #btn-list{width:200px;overflow:hidden;}
#calculator #btn-list .btn-radius{border-radius:2px;-webkit-border-radius:2px;-moz-border-radius:2px;border:1px solid #e5e5e5;background:-webkit-gradient(linear, 0 0, 0 100%, from(#f7f7f7), to(#ebebeb));background:-moz-linear-gradient(top, #f7f7f7,#ebebeb);filter:progid:DXImageTransform.Microsoft.gradient(startColorstr=#f7f7f7,endColorstr=#ebebeb,grandientType=1);line-height:29px;text-align:center;text-shadow:0px 1px 1px #FFF;font-weight:bold;font-family:Verdana, Geneva, sans-serif;color:#666;float:left;margin-left:11px;margin-top:11px;font-size:12px;cursor:pointer;}
#calculator #btn-list .btn-radius:active{background:#ffffff;}
#calculator #btn-list .clear-marginleft{margin-left:0;}
#calculator #btn-list .font-14{font-size:14px;}
#calculator #btn-list .color-red{color:#ff5050}
#calculator #btn-list .color-blue{color:#00b4ff}
#calculator #btn-list .btn-30{width:29px;height:29px;}
#calculator #btn-list .btn-70{width:70px;height:29px;}
3. 使用本站HTML/CSS/JS在线运行测试工具：http://tools.jb51.net/code/HtmlJsRun，可得到如下测试运行效果：
4. 使用时记得改下css路径,在html中引入vue
5. 博主技术有限,正负号部分功能还有问题待完善.计算器还有一些未知的小Bug,感兴趣的读者可以在这个基础上进行扩展。
PS：这里再为大家推荐几款计算工具供大家参考：
在线数学表达式简单转换/计算工具：
http://tools.jb51.net/jisuanqi/exp_jisuanqi
在线一元函数（方程）求解计算工具：
http://tools.jb51.net/jisuanqi/equ_jisuanqi
科学计算器在线使用_高级计算器在线计算：
http://tools.jb51.net/jisuanqi/jsqkexue
在线计算器_标准计算器：
http://tools.jb51.net/jisuanqi/jsq
希望本文所述对大家vue.js程序设计有所帮助。
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