jquery 怎么判断id=x的<div>在不在
时间: 2024-04-12 20:27:27 浏览: 17
你可以使用jQuery的选择器来判断指定id的<div>元素是否存在。可以使用`$('#x').length`来检查匹配到的元素数量,如果返回值大于0,则表示该元素存在,否则表示该元素不存在。下面是一个示例代码:
```javascript
if ($('#x').length > 0) {
console.log('元素存在');
} else {
console.log('元素不存在');
}
```
在上面的代码中,`#x`是选择器,表示id为"x"的元素。`$('#x').length`会返回匹配到的元素数量,如果大于0,则表示找到了对应的元素。
相关问题
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <title>登录界面</title> </head> <body> <!-- 登录界面 --> <div id="page_login"> <div class="loginContainer"> <div style="font-size: 36px;margin-bottom: 20px;text-align: center;font-family: 'Lucida Sans', 'Lucida Sans Regular', 'Lucida Grande', 'Lucida Sans Unicode', Geneva, Verdana, sans-serif;"> Login</div> <input type="text" name="account" id="account" placeholder="account"> <input type="password" name="password" id="password" placeholder="password"> <button id="loginButton" onclick="getLogin()">login</button> </div> </div> </body> <script type="text/javascript" src="./js/index.js"></script> <script src="./js/jquery-3.3.1.js"></script> </html>
好的,以下是美化后的代码,使用了一些基本的CSS样式和布局:
```
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<title>登录界面</title>
<style>
body {
margin: 0;
padding: 0;
background-color: #f2f2f2;
font-family: 'Lucida Sans', 'Lucida Sans Regular', 'Lucida Grande', 'Lucida Sans Unicode', Geneva, Verdana, sans-serif;
}
#page_login {
display: flex;
justify-content: center;
align-items: center;
height: 100vh;
}
.loginContainer {
display: flex;
flex-direction: column;
align-items: center;
justify-content: center;
background-color: white;
border-radius: 5px;
box-shadow: 0px 0px 10px rgba(0,0,0,0.2);
padding: 30px;
}
.loginContainer > div {
font-size: 36px;
margin-bottom: 20px;
text-align: center;
}
input[type="text"], input[type="password"] {
width: 100%;
padding: 10px;
margin-bottom: 10px;
border: none;
border-radius: 5px;
box-shadow: 0px 0px 5px rgba(0,0,0,0.1);
}
#loginButton {
background-color: #007bff;
color: white;
padding: 10px 20px;
border: none;
border-radius: 5px;
box-shadow: 0px 0px 5px rgba(0,0,0,0.1);
transition: all 0.2s ease-in-out;
}
#loginButton:hover {
transform: scale(1.05);
box-shadow: 0px 0px 10px rgba(0,0,0,0.2);
}
</style>
</head>
<body>
<!-- 登录界面 -->
<div id="page_login">
<div class="loginContainer">
<div>Login</div>
<input type="text" name="account" id="account" placeholder="account">
<input type="password" name="password" id="password" placeholder="password">
<button id="loginButton" onclick="getLogin()">login</button>
</div>
</div>
</body>
<script type="text/javascript" src="./js/index.js"></script>
<script src="./js/jquery-3.3.1.js"></script>
</html>
```
<! DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>淘宝数据分析可视化</title> <script src="https:/ /cdn.bootcdn.net/ajax/libs/jquery/3.5.1/jquery.min.js"></script> <script src="https://cdn.bootcss.com/echarts/3.6.2/echarts.min.js"></script> </head> <body> <h1 align="center ">Spark淘宝数据分析可视化图表</h1> <div class="empty"></div> <div class="contain"> <div id="box1" class="public"></div> <div id="box2" class="public"></div> <div id="box3" class="public"></div> <div id="box4" class="public"></div> </div> <script type="text/javascript"> $.getJSON( " /static/result1.json ", function(data) { var name = [ ] var value = [ ] $.each(data,function(key,val) { name. push(val[ "action" ]); value.push({ " value " : val[ "count"], "name " : val[ "action "] }) }); var mychart1 = echants. init(document.getElementById( ' box1')); //指定图表的配置项和数据 var option1 = { } </script> <script type="text/javascript"></script> <script type="text/javascript"></script> <script type="text/javascript"></script> <script type="text/javascript"></script> </body> 帮我补充var option1中的代码
可以根据数据的具体情况来补充相应的代码,以下是一些可能会用到的常见配置项和数据设置:
1. 饼图配置项和数据设置:
```
var option1 = {
title : {
text: '用户行为统计',
x:'center'
},
tooltip : {
trigger: 'item',
formatter: "{a} <br/>{b} : {c} ({d}%)"
},
legend: {
orient: 'vertical',
left: 'left',
data: name
},
series : [
{
name: '用户行为',
type: 'pie',
radius : '55%',
center: ['50%', '60%'],
data: value.sort(function (a, b) { return a.value - b.value; }),
itemStyle: {
emphasis: {
shadowBlur: 10,
shadowOffsetX: 0,
shadowColor: 'rgba(0, 0, 0, 0.5)'
}
}
}
]
};
```
2. 柱状图配置项和数据设置:
```
var option1 = {
title: {
text: '用户行为统计',
x: 'center'
},
tooltip: {
trigger: 'axis',
axisPointer: {
type: 'shadow'
}
},
legend: {
data: name,
x: 'left'
},
grid: {
left: '3%',
right: '4%',
bottom: '3%',
containLabel: true
},
xAxis: {
type: 'category',
data: name
},
yAxis: {
type: 'value'
},
series: [
{
name: '用户行为',
type: 'bar',
data: value,
itemStyle: {
emphasis: {
shadowBlur: 10,
shadowOffsetX: 0,
shadowColor: 'rgba(0, 0, 0, 0.5)'
}
}
}
]
};
```
3. 折线图配置项和数据设置:
```
var option1 = {
title: {
text: '用户行为统计',
x: 'center'
},
tooltip: {
trigger: 'axis'
},
legend: {
data: name,
x: 'left'
},
grid: {
left: '3%',
right: '4%',
bottom: '3%',
containLabel: true
},
xAxis: {
type: 'category',
boundaryGap: false,
data: name
},
yAxis: {
type: 'value'
},
series: [
{
name: '用户行为',
type: 'line',
stack: '总量',
data: value,
itemStyle: {
emphasis: {
shadowBlur: 10,
shadowOffsetX: 0,
shadowColor: 'rgba(0, 0, 0, 0.5)'
}
}
}
]
};
```