就不多说了，直接贴代码，不懂的底下留言就好。
HTML代码
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>计算器</title>
<link rel="stylesheet" href="calculator.css">
</head>
<body>
<div class="box">
<p class="outBox">0</p>
<ul>
<li>tan</li>
<li>cos</li>
<li>sin</li>
<li>+</li>
<li>1</li>
<li>2</li>
<li>3</li>
<li>-</li>
<li>4</li>
<li>5</li>
<li>6</li>
<li>*</li>
<li>7</li>
<li>8</li>
<li>9</li>
<li>/</li>
<li>0</li>
<li>+/-</li>
<li>.</li>
<li>清空</li>
<li class="calculator">=</li>
</ul>
<p class="notice">
1.本计算器计算数字为5位小数点；<br/>
2.最大数值为99999999；
</p>
</div>
<script src="calculator.js"></script>
</body>
</html>
css代码
*
{
margin: 0;
padding: 0;
}
li
{
list-style: none;
}
body,
html
{
background: #efefef;
}
.box
{
width: 460px;
height: 480px;
margin: 0 auto;
margin-top: 50px;
padding-top: 20px;
padding-bottom: 10px;
border-right: 1px solid #666;
border-bottom: 1px solid #666;
border-radius: 5px;
background: #ccc;
box-shadow: 0 3px 10px #999;
}
.outBox
{
font-size: 50px;
line-height: 60px;
width: 400px;
height: 60px;
margin: 0 auto;
padding: 0 10px;
text-align: right;
border: 1px solid #aaa;
border-radius: 4px;
background: #fff;
}
.box ul
{
display: inline-block;
width: 420px;
margin-left: 20px;
}
.box ul li
{
font-size: 20px;
line-height: 33px;
float: left;
box-sizing: border-box;
width: 90px;
height: 40px;
margin-top: 20px;
margin-left: 20px;
cursor: pointer;
text-align: center;
color: #eee;
border: 1px solid #aaa;
border-radius: 4px;
background: -webkit-linear-gradient(top,#8fa1ff, #3757fa);
}
.box ul li:nth-child(4n-3)
{
margin-left: 0;
}
.box ul li:hover
{
background: -webkit-linear-gradient(top, #3757fa,#8fa1ff);
}
.box ul li:nth-child(1)
{
background: -webkit-linear-gradient(top,#2e6da4, #3757fa);
}
.box ul li:nth-child(2)
{
background: -webkit-linear-gradient(top,#2e6da4, #3757fa);
}
.box ul li:nth-child(3)
{
background: -webkit-linear-gradient(top,#2e6da4, #3757fa);
}
.box ul li.calculator
{
width: 100%;
}
.box ul li:nth-child(1),
.box ul li:nth-child(2),
.box ul li:nth-child(3),
.box ul li.calculator:hover
{
background: -webkit-linear-gradient(top,#3757fa,#2e6da4);
}
.notice
{
font-size: 12px;
line-height: 16px;
margin-top: 10px;
margin-left: 20px;
color: #999;
}
js代码
window.onload = function(){
/**
* [$ 获取元素]
* @param {[type]} param [description]
* @return {[type]} [description]
*/
var $ = function(param){
return document.querySelectorAll(param);
};
// 是否保留计算
var isPrintOperator = true;
// 计算公式字符串
var isCount = "";
// 输出功能按键index
var calulatorArr = [0,1,2,20];
// 计算功能按键
var operationArr = [3,7,11,15];
// 数字键
var count = [4,5,6,8,9,10,12,13,14,16,18];
// 正负
var number = [17];
// 清空
var empty = [19];
for(var i=0;i<count.length;i++){
addClick(count[i]);
}
for(var j=0;j<operationArr.length;j++){
operation(operationArr[j]);
}
for(var k=0;k<calulatorArr.length;k++){
calulator(calulatorArr[k]);
}
/**
* [addClick 数字键点击事件]
* @param {[type]} index [description]
*/
function addClick(index){
$('.box li')[index].addEventListener("click", function(){
var $outBox = $('.outBox')[0];
if(!isPrintOperator){
$outBox.innerHTML = 0;
isPrintOperator = true;
}
var _html = this.innerHTML;
var _outBoxHtml = $outBox.innerHTML;
var _length = 0;
var splitCount = _outBoxHtml.split(".");
!splitCount[0].indexOf('-')?_length = splitCount[0].length-1:_length = splitCount[0].length;
if(_html == "." && _outBoxHtml.indexOf('.') != -1){
return false;
}
if(_html == "." || _outBoxHtml.indexOf('.') != -1){
if(splitCount[1] && splitCount[1].length >=5){
return false;
}
}else{
if(_length>=8){
return false;
}
}
if(_outBoxHtml === '0' && _html != "."){
$outBox.innerHTML = _html;
isCount += _html;
return false;
}
$outBox.innerHTML = _outBoxHtml+_html;
isCount += _html;
});
};
/**
* [正负数按键]
* @param {[type]} ){ var $outBox [description]
* @return {[type]} [description]
*/
$('.box li')[number[0]].addEventListener("click",function(){
var $outBox = $('.outBox')[0];
var _outBoxHtml = $outBox.innerHTML;
if(_outBoxHtml === '0'){
return false;
}
if(isCount === ""){
return false;
}
if(!_outBoxHtml.indexOf('-')){
isCount = $outBox.innerHTML = _outBoxHtml.replace('-','');
}else{
$outBox.innerHTML = "-"+_outBoxHtml;
isCount = "-"+isCount;
}
});
/**
* [清空按键]
* @param {[type]} ){ var $outBox [description]
* @return {[type]} [description]
*/
$('.box li')[empty[0]].addEventListener('click',function(){
var $outBox = $('.outBox')[0];
isCount = "";
isPrintOperator = true;
$outBox.innerHTML = 0;
});
/**
* [operation 计算功能操作]
* @param {[type]} index [description]
* @return {[type]} [description]
*/
function operation(index){
$('.box li')[index].addEventListener('click',function(){
var $outBox = $('.outBox')[0];
var _html = this.innerHTML;
var isCalculated = isCount.substr(isCount.length-1,1);
isPrintOperator = false;
if(isCalculated == "+" || isCalculated == "-" || isCalculated == "*" || isCalculated == "/"){
isCount = isCount.substr(0,isCount.length-1);
}
isCount = $outBox.innerHTML = eval(isCount);
if(isCount === undefined){
isCount = $outBox.innerHTML = 0;
}
var splitCount = isCount.toString().split(".");
if(splitCount[1] !== undefined && splitCount[1].length > 5){
isCount = $outBox.innerHTML = splitCount[0]+"."+splitCount[1].substr(0,5)
}
if(isCount == 'NaN'){
isCount = $outBox.innerHTML = 0;
}
if(isCount == "Infinity"){
alert("这个数字有点大！从0开始吧～")
isCount = $outBox.innerHTML = 0;
}
if(isCount == "-0"){
isCount = $outBox.innerHTML = 0;
}
if(isCount >= 99999999){
alert("这个数字有点大，我算不过来啦～呜呜呜～。重新计算吧！");
isCount = $outBox.innerHTML = 0;
}
isCount += _html;
});
};
/**
* [checkResult 校验结果]
* @param {[type]} param [description]
* @return {[type]} [description]
*/
function checkResult(param){
if(param === undefined){
return 0;
}
var splitCount = param.toString().split(".");
if(splitCount[1] !== undefined && splitCount[1].length > 5){
return splitCount[0]+"."+splitCount[1].substr(0,5)
}
if(param == "Infinity"){
alert("这个数字有点大！从0开始吧～")
return 0;
}
if(param == 'NaN'){
return 0;
}
if(param == "-0"){
return 0;
}
if(param == "0.0"){
return 0;
}
if(param >= 99999999){
alert("这个数字有点大，我算不过来啦～呜呜呜～。重新计算吧！");
return 0;
}
return param;
}
/**
* [calulator 输出数字]
* @param {[type]} index [description]
* @return {[type]} [description]
*/
function calulator(index){
$('.box li')[index].addEventListener('click',function(){
var $outBox = $('.outBox')[0];
var _outBoxHtml = $outBox.innerHTML;
var _html = this.innerHTML;
if(_html === "sin"){
isPrintOperator = true;
isCount = $outBox.innerHTML = checkResult(Math.sin(_outBoxHtml));
}else if(_html === "cos"){
isPrintOperator = true;
isCount = $outBox.innerHTML = checkResult(Math.cos(_outBoxHtml));
}else if(_html === "tan"){
isPrintOperator = true;
isCount = $outBox.innerHTML = checkResult(Math.tan(_outBoxHtml));
}else{
$outBox.innerHTML = checkResult(eval(isCount));
isCount = $outBox.innerHTML;
isPrintOperator = true;
}
});
}
};
如果有什么更好的建议和见解，欢迎留言～～
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