本文实例为大家分享了javascript实现简易计算器的具体代码，供大家参考，具体内容如下
编辑了几个小时研发了一个简易好理解的计算器。不停改Bug，终于改好了。
这是样式
这是Css部分
<style>
#box {
background-image : linear-gradient( 120 deg, #84fab0 0% , #8fd3f4 100% );
width : 500px ;
height : 420px ;
margin : auto ;
margin-top : 200px ;
position : relative ;
}
.reckon {
width : 280px ;
height : 200px ;
background-image : linear-gradient( 120 deg, #d4fc79 0% , #96e6a1 100% );
;
position : absolute ;
top : 100px ;
left : 100px ;
border : 5px solid #2a2b2c
}
#input 1 {
background-image : linear-gradient(to top , #cfd9df 0% , #e2ebf0 100% );
border : none ;
width : 220px ;
height : 8px ;
float : right ;
margin-top : 10px ;
margin-right : 20px ;
outline : none ;
padding : 10px
}
ul li {
float : left ;
list-style : none ;
margin : 4px 2px ;
border-radius: 3px ;
background-image : linear-gradient( 120 deg, #a1c4fd 0% , #c2e9fb 100% );
box-shadow: 2px 2px #ccc ;
color : #fff ;
font-weight : "楷体" ;
width : 50px ;
height : 30px ;
text-align : center ;
line-height : 30px ;
}
ul {
margin-top : 5px ;
}
ul li:hover {
opacity: 0.7 ;
}
</style>
这是HTML部分
< div id = "box" >
< div class = "reckon" id = "reckon" >
< input type = "text" id = "input1" >
< ul >
< li class = "num" >7</ li >
< li class = "num" >8</ li >
< li class = "num" >9</ li >
< li class = "opcr" >+</ li >
< li class = "num" >4</ li >
< li class = "num" >5</ li >
< li class = "num" >6</ li >
< li class = "opcr" >- </ li >
< li class = "num" >1</ li >
< li class = "num" >2</ li >
< li class = "num" >3</ li >
< li class = "opcr" >*</ li >
< li class = "num" >0</ li >
< li id = "returnZero" >C</ li >
< li id = "resule" >=</ li >
< li class = "opcr" >/</ li >
</ ul >
</ div >
</ div >
/* 定义两个标签来存放符号跟第一个值*/
< input type = "text" id = "text1" style = "display:none" >
< input type = "text" id = "per" style = "display:none" >
html部分的话就是吧所有数字定义为一个class名字，把所有运算符号定义为一个class 以及定义两个input来存放运算符
<script>
lis = document.querySelectorAll( "#box ul .num" ) //获取所有的数字
opcr = document.querySelectorAll( "#box ul .opcr" ) //获取运算符
for ( var i = 0; i < lis.length; i++) { //遍历所有的数字
lis[i].onclick = function () {
input1.value += parseInt( this .innerHTML) //点击input1显示
}
}
//遍历所有的运算符
for (let i = 0; i < opcr.length; i++) {
opcr[i].onclick = function () {
if (text1.value == "" ) { //当存放第一个值为空时候
text1.value = input1.value //存放第一个值
input1.value = "" //input框里的值为空
per.value = this .innerHTML; //存放符号的值为空
} else {
text1.value = eval(text1.value + per.value + input1.value) //不是空的时候 计算
per.value = this .innerHTML; //存放符号的值为点击的值
input1.value = "" //input框里的值为空
}
}
}
//等于
resule.onclick = function () {
input1.value = eval(text1.value + per.value + input1.value) //计算里面的值
per.value = "" //清空存放per的值
text1.value = "" //input框里的值为空
}
//点击清空所有
returnZero.onclick = function () {
input1.value = ""
per.value = ""
text1.value = ""
}
</script>
完整部分
<!DOCTYPE html>
< html lang = "en" >
< head >
< meta charset = "UTF-8" >
< meta name = "viewport" content = "width=device-width, initial-scale=1.0" >
< meta http-equiv = "X-UA-Compatible" content = "ie=edge" >
< title >简易计算器</ title >
< style >
#box {
background-image: linear-gradient(120deg, #84fab0 0%, #8fd3f4 100%);
width: 500px;
height: 420px;
margin: auto;
margin-top: 200px;
position: relative;
}
.reckon {
width: 280px;
height: 200px;
background-image: linear-gradient(120deg, #d4fc79 0%, #96e6a1 100%);
;
position: absolute;
top: 100px;
left: 100px;
border: 5px solid #2a2b2c
}
#input1 {
background-image: linear-gradient(to top, #cfd9df 0%, #e2ebf0 100%);
border: none;
width: 220px;
height: 8px;
float: right;
margin-top: 10px;
margin-right: 20px;
outline: none;
padding: 10px
}
ul li {
float: left;
list-style: none;
margin: 4px 2px;
border-radius: 3px;
background-image: linear-gradient(120deg, #a1c4fd 0%, #c2e9fb 100%);
box-shadow: 2px 2px #ccc;
color: #fff;
font-weight: "楷体";
width: 50px;
height: 30px;
text-align: center;
line-height: 30px;
}
ul {
margin-top: 5px;
}
ul li:hover {
opacity: 0.7;
}
</ style >
</ head >
< body >
< div id = "box" >
< div class = "reckon" id = "reckon" >
< input type = "text" id = "input1" >
< ul >
< li class = "num" >7</ li >
< li class = "num" >8</ li >
< li class = "num" >9</ li >
< li class = "opcr" >+</ li >
< li class = "num" >4</ li >
< li class = "num" >5</ li >
< li class = "num" >6</ li >
< li class = "opcr" >- </ li >
< li class = "num" >1</ li >
< li class = "num" >2</ li >
< li class = "num" >3</ li >
< li class = "opcr" >*</ li >
< li class = "num" >0</ li >
< li id = "returnZero" >C</ li >
< li id = "resule" >=</ li >
< li class = "opcr" >/</ li >
</ ul >
</ div >
</ div >
< input type = "text" id = "text1" style = "display:block" >
< input type = "text" id = "per" style = "display:block" >
< script >
lis = document.querySelectorAll("#box ul .num")//获取所有的数字
opcr = document.querySelectorAll("#box ul .opcr")//获取+——*/
for (var i = 0; i < lis.length ; i++) { //遍历所有的数字
lis[i] .onclick = function () {
input1.value += parseInt(this.innerHTML)//点击input1显示
}
}
//遍历所有的+——*/
for (let i = 0 ; i < opcr.length; i++) {
opcr[i] .onclick = function () {
if (text1.value == "") {//当存放第一个值为空时候
text1.value = input1 .value//存放第一个值
input1.value = "" //input框里的值为空
per.value = this .innerHTML; //存放符号的值为空
} else {
text1.value = eval (text1.value + per.value + input1.value)//不是空的时候 计算值
per.value = this .innerHTML;//存放符号的值为点击的值
input1.value = "" //input框里的值为空
}
}
}
//等于
resule.onclick = function () {
input1.value = eval (text1.value + per.value + input1.value)//计算里面的值
per.value = "" //清空存放per的值
text1.value = "" //input框里的值为空
}
//点击清空所有
returnZero.onclick = function () {
input1.value = ""
per.value = ""
text1.value = ""
}
</script>
</ body >
</ html >
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。
原文链接：https://blog.csdn.net/m0_52773472/article/details/109909622
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