在javasc中计算(“9.8”+7.6)结果是多少
时间: 2024-03-21 07:39:43 浏览: 150
在JavaScript中,计算(“9.8”+7.6)的结果是字符串"9.87.6",因为加号(+)在JavaScript中既可以用于数字的加法运算,也可以用于字符串的拼接操作。当一个字符串和一个数字进行拼接操作时,JavaScript会将数字转换为字符串,然后将两个字符串连接起来。如果想要得到数字的加法运算结果,可以将字符串转换为数字,然后再进行计算。例如:
```
var result = parseFloat("9.8") + 7.6;
console.log(result); // 输出结果为 17.4
```
相关问题
html+css+javasc双色球用模态框选球和中奖提示代码
以下是一个简单的 HTML、CSS 和 JavaScript 实现双色球选球和中奖提示的模态框代码:
HTML 代码:
```
<div class="container">
<h1>双色球选球</h1>
<button class="btn" onclick="openModal()">选球</button>
</div>
<!-- 模态框 -->
<div id="myModal" class="modal">
<div class="modal-content">
<span class="close" onclick="closeModal()">×</span>
<h2>请选择6个红球和1个蓝球</h2>
<div class="balls">
<div class="red-balls">
<!-- 33个红球 -->
<div class="ball" onclick="toggleBall(this)">1</div>
<div class="ball" onclick="toggleBall(this)">2</div>
<div class="ball" onclick="toggleBall(this)">3</div>
<div class="ball" onclick="toggleBall(this)">4</div>
<div class="ball" onclick="toggleBall(this)">5</div>
<div class="ball" onclick="toggleBall(this)">6</div>
<div class="ball" onclick="toggleBall(this)">7</div>
<div class="ball" onclick="toggleBall(this)">8</div>
<div class="ball" onclick="toggleBall(this)">9</div>
<div class="ball" onclick="toggleBall(this)">10</div>
<div class="ball" onclick="toggleBall(this)">11</div>
<div class="ball" onclick="toggleBall(this)">12</div>
<div class="ball" onclick="toggleBall(this)">13</div>
<div class="ball" onclick="toggleBall(this)">14</div>
<div class="ball" onclick="toggleBall(this)">15</div>
<div class="ball" onclick="toggleBall(this)">16</div>
<div class="ball" onclick="toggleBall(this)">17</div>
<div class="ball" onclick="toggleBall(this)">18</div>
<div class="ball" onclick="toggleBall(this)">19</div>
<div class="ball" onclick="toggleBall(this)">20</div>
<div class="ball" onclick="toggleBall(this)">21</div>
<div class="ball" onclick="toggleBall(this)">22</div>
<div class="ball" onclick="toggleBall(this)">23</div>
<div class="ball" onclick="toggleBall(this)">24</div>
<div class="ball" onclick="toggleBall(this)">25</div>
<div class="ball" onclick="toggleBall(this)">26</div>
<div class="ball" onclick="toggleBall(this)">27</div>
<div class="ball" onclick="toggleBall(this)">28</div>
<div class="ball" onclick="toggleBall(this)">29</div>
<div class="ball" onclick="toggleBall(this)">30</div>
<div class="ball" onclick="toggleBall(this)">31</div>
<div class="ball" onclick="toggleBall(this)">32</div>
<div class="ball" onclick="toggleBall(this)">33</div>
</div>
<div class="blue-balls">
<!-- 16个蓝球 -->
<div class="ball" onclick="toggleBall(this)">1</div>
<div class="ball" onclick="toggleBall(this)">2</div>
<div class="ball" onclick="toggleBall(this)">3</div>
<div class="ball" onclick="toggleBall(this)">4</div>
<div class="ball" onclick="toggleBall(this)">5</div>
<div class="ball" onclick="toggleBall(this)">6</div>
<div class="ball" onclick="toggleBall(this)">7</div>
<div class="ball" onclick="toggleBall(this)">8</div>
<div class="ball" onclick="toggleBall(this)">9</div>
<div class="ball" onclick="toggleBall(this)">10</div>
<div class="ball" onclick="toggleBall(this)">11</div>
<div class="ball" onclick="toggleBall(this)">12</div>
<div class="ball" onclick="toggleBall(this)">13</div>
<div class="ball" onclick="toggleBall(this)">14</div>
<div class="ball" onclick="toggleBall(this)">15</div>
<div class="ball" onclick="toggleBall(this)">16</div>
</div>
</div>
<button class="btn" onclick="checkBalls()">确认</button>
</div>
</div>
<!-- 中奖提示框 -->
<div id="winModal" class="modal">
<div class="modal-content">
<span class="close" onclick="closeWinModal()">×</span>
<h2>恭喜您中奖了!</h2>
<p>您选中的号码是:<span id="winBalls"></span></p>
<p>奖金金额为:<span id="winMoney"></span></p>
</div>
</div>
```
CSS 代码:
```
.container {
text-align: center;
}
.btn {
padding: 10px 20px;
font-size: 16px;
background-color: #4CAF50;
color: #fff;
border: none;
border-radius: 5px;
cursor: pointer;
}
.modal {
display: none;
position: fixed;
z-index: 1;
left: 0;
top: 0;
width: 100%;
height: 100%;
overflow: auto;
background-color: rgba(0, 0, 0, 0.4);
}
.modal-content {
background-color: #fefefe;
margin: 15% auto;
padding: 20px;
border: 1px solid #888;
width: 80%;
max-width: 600px;
border-radius: 5px;
}
.close {
color: #aaa;
float: right;
font-size: 28px;
font-weight: bold;
cursor: pointer;
}
.close:hover,
.close:focus {
color: black;
text-decoration: none;
cursor: pointer;
}
.balls {
display: flex;
justify-content: space-between;
margin-top: 20px;
}
.red-balls .ball {
width: 40px;
height: 40px;
line-height: 40px;
text-align: center;
border: 1px solid #ccc;
border-radius: 50%;
font-size: 16px;
margin-bottom: 10px;
cursor: pointer;
}
.blue-balls .ball {
width: 40px;
height: 40px;
line-height: 40px;
text-align: center;
border: 1px solid #ccc;
border-radius: 50%;
font-size: 16px;
margin-bottom: 10px;
cursor: pointer;
background-color: #3385FF;
color: #fff;
}
.ball.selected {
background-color: #4CAF50;
color: #fff;
}
#winBalls {
font-size: 18px;
font-weight: bold;
}
#winMoney {
font-size: 18px;
font-weight: bold;
color: #FF6600;
}
```
JavaScript 代码:
```
// 打开模态框
function openModal() {
document.getElementById("myModal").style.display = "block";
}
// 关闭模态框
function closeModal() {
document.getElementById("myModal").style.display = "none";
}
// 打开中奖提示框
function openWinModal(balls, money) {
document.getElementById("winBalls").innerHTML = balls.join(", ");
document.getElementById("winMoney").innerHTML = money;
document.getElementById("winModal").style.display = "block";
}
// 关闭中奖提示框
function closeWinModal() {
document.getElementById("winModal").style.display = "none";
}
// 切换选中状态
function toggleBall(ball) {
ball.classList.toggle("selected");
}
// 随机生成6个红球和1个蓝球
function generateBalls() {
var redBalls = [];
var blueBall = Math.floor(Math.random() * 16) + 1;
while (redBalls.length < 6) {
var ball = Math.floor(Math.random() * 33) + 1;
if (redBalls.indexOf(ball) === -1) {
redBalls.push(ball);
}
}
return {
redBalls: redBalls.sort(function(a, b) {
return a - b;
}),
blueBall: blueBall
};
}
// 检查选择的球是否正确
function checkBalls() {
var selectedBalls = document.querySelectorAll(".ball.selected");
if (selectedBalls.length !== 7) {
alert("请选择6个红球和1个蓝球!");
return;
}
var redBalls = [];
var blueBall = null;
selectedBalls.forEach(function(ball) {
var ballValue = parseInt(ball.innerHTML);
if (ball.classList.contains("red-balls")) {
redBalls.push(ballValue);
} else {
blueBall = ballValue;
}
});
if (redBalls.length !== 6 || !blueBall) {
alert("请选择6个红球和1个蓝球!");
return;
}
var winBalls = generateBalls();
var redHitCount = 0;
var blueHitCount = 0;
redBalls.forEach(function(ball) {
if (winBalls.redBalls.indexOf(ball) !== -1) {
redHitCount++;
}
});
if (blueBall === winBalls.blueBall) {
blueHitCount = 1;
}
var hitCount = redHitCount + blueHitCount;
var money = null;
switch (hitCount) {
case 7:
money = "一等奖";
break;
case 6:
money = "二等奖";
break;
case 5:
money = "三等奖";
break;
case 4:
money = "四等奖";
break;
case 3:
money = "五等奖";
break;
default:
money = "未中奖";
}
openWinModal(winBalls.redBalls.concat(winBalls.blueBall), money);
}
```
以上代码实现了一个简单的双色球选球和中奖提示的模态框,包括随机生成中奖号码、切换选中状态、检查选择的球是否正确等功能。你可以根据自己的需要进行修改和完善。
javasc思维导图
JavaScrum思维导图是一种可视化工具,用于组织和理解Scrum框架中的关键概念、角色、事件和工件。Scrum是一种敏捷开发方法,适用于软件项目管理。以下是一个简单的JavaScrum思维导图概述:
1. **中心:** Scrum框架
2. **核心角色:**
- **Product Owner(产品负责人):** 定义需求优先级和价值
- **Scrum Master( scrum 主管):** 规范仪式,协助团队遵循规则
- **Development Team(开发团队):** 自组织完成用户故事
3. **迭代周期:** Sprints (固定时间段)
4. **重要事件:**
- **Sprint Planning( sprint 计划会议):** 确定 sprint 目标和任务
- **Daily Scrum(每日站立会议):** 检查进度,识别障碍
- **Sprint Review( sprint 回顾会议):** 展示工作成果,反馈改进
- **Sprint Retrospective( sprint 反思会议):** 团队自我改进
5. **工件:**
- **Product Backlog(产品积压):** 未完成的工作列表
- **Sprint Backlog( sprint 计划):** 当前 sprint 内的任务
- **Sprint Burndown Chart(燃尽图):** 显示剩余工作量
- **Increment(增量):** sprint 结束时交付的可用功能
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