我有三个javascript文件(每个文件的开头如下所示(。每个后续声明都在一个单独的文件中，因此变量名重叠不应成为问题。
let ctx = document.getElementById('myChart').getContext('2d');
let labels = ['Banking', 'Finances', 'Shopping', 'Recreation', 'Healthcare', 'Transportation', 'Food and Drink'];
let colorHex = ['#FB3640', '#86A9C5', '#286CA1', '#77FAC', '#1C203D', '#798E9C', '#2A303D'];
let myChart = new Chart(ctx, {
type: 'pie',
data: {
datasets: [{
data: [10, 10, 10, 10, 10, 10, 10],
backgroundColor: colorHex,
borderWidth: [0,0,0,0,0,0,0]
}],
labels: labels,
},
options: {
responsive: false,
legend: {
position: 'bottom'
},
plugins: {
datalabels: {
color: '#fff',
anchor: 'end',
align: 'start',
offset: 10,
borderWidth: 0,
// borderColor: '#fff',
borderRadius: 0,
font: {
size: '10',
color: '#fff'
},
formatter: (value) => {
return value + ' %';
}
}
}
}
})
let ctx2 = document.getElementById('myChart2').getContext('2d');
let labels2 = ['Banking', 'Finances', 'Shopping', 'Recreation', 'Healthcare', 'Transportation', 'Food and Drink'];
let colorHex2 = ['#FB3640', '#86A9C5', '#286CA1', '#77FAC', '#1C203D', '#798E9C', '#2A303D'];
let myChart2 = new Chart(ctx2, {
type: 'pie',
data: {
datasets: [{
data: [10, 10, 10, 10, 10, 10, 10],
backgroundColor: colorHex,
borderWidth: [0,0,0,0,0,0,0]
}],
labels: labels,
},
options: {
responsive: false,
legend: {
position: 'bottom'
},
plugins: {
datalabels: {
color: '#fff',
anchor: 'end',
align: 'start',
offset: 10,
borderWidth: 0,
// borderColor: '#fff',
borderRadius: 0,
font: {
size: '10',
color: '#fff'
},
formatter: (value) => {
return value + ' %';
}
}
}
}
})
let ctx3 = document.getElementById('myChart3').getContext('2d');
let labels3 = ['Banking', 'Finances', 'Shopping', 'Recreation', 'Healthcare', 'Transportation', 'Food and Drink'];
let colorHex3 = ['#FB3640', '#86A9C5', '#286CA1', '#77FAC', '#1C203D', '#798E9C', '#2A303D'];
let myChart3 = new Chart(ctx3, {
type: 'pie',
data: {
datasets: [{
data: [10, 10, 10, 10, 10, 10, 10],
backgroundColor: colorHex,
borderWidth: [0,0,0,0,0,0,0]
}],
labels: labels,
},
options: {
responsive: false,
legend: {
position: 'bottom'
},
plugins: {
datalabels: {
color: '#fff',
anchor: 'end',
align: 'start',
offset: 10,
borderWidth: 0,
// borderColor: '#fff',
borderRadius: 0,
font: {
size: '10',
color: '#fff'
},
formatter: (value) => {
return value + ' %';
}
}
}
}
})
然而，当我将它们嵌入到我的html文件(如下所示(中时，只有第一个会出现。
<!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>Viewer | Analysis</title>
<link rel="stylesheet" href="../static/analysis.css">
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.7.3/Chart.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/chartjs-plugin-datalabels"></script>
<script src="./js/script.js"></script>
<script src="Chart3.js" type="text/javascript"></script>
</head>
<body>
<!-- <header class = "Header">Hi</header> -->
<div class = "sidenav">
<a href="#">About</a>
<a href="#">Services</a>
<a href="#">Clients</a>
<a href="#">Contact</a>
</div>
<script src="Chart.js" type="text/javascript"></script>
<div class="Top-Box">
<div class = "Translucent-Box">
<h1 class = "Box-Header">Categorical Spending Left</h1>
<canvas id= "myChart" height="250" width="250"></canvas>
</div>
<div class = "Translucent-Box">
<h1 class = "Box-Header">Categorical Spending Center</h1>
<canvas id = "myChart2" height="500" width="500"></canvas>
<canvas class ="myChart2" width="640" height="480" style="position: absolute; z-index: 1"></canvas>
</div>
<div class = "Translucent-Box">
<h1 class = "Box-Header">Categorical Spending Left</h1>
<canvas id = "myChart3" height="250" width="250"></canvas>
</div>
</div>
</body>
</html>
我已经被困了几个小时了，所以我们非常感谢您的帮助。
感谢
编辑：更奇怪的是，我做了一个JSFiddle-https://jsfiddle.net/EDP1000/sc38nr2p/2/-而且效果非常好。但是，当我在VSCode中运行代码时，它不会。
我认为使用let来声明变量而不是全局声明是个问题。如果所有其他元素，如字体和颜色，我只需要一次该信息，不同的信息，只需要文件引用ID部分和标题，但会消除在本地声明而不是全局声明中重复的多个变量
我觉得这是一堆东西的组合。
您有相当混乱的语法和大量的<div id = 'thing spaces'...之类的东西。我还认为存在一些相互矛盾的绝对定位。
由于这些图在您的示例中重复，因此我将代码封装在一个函数中，以明确变量的范围。
function createChart(whateverCanvasId) {
let ctx = document.getElementById(whateverCanvasId).getContext('2d');
// do whatever stuff...
}
createChart('myChart');
createChart('myChart2');
createChart('myChart3');
并将其放入一个非常简化的CodePen中。(我们不需要知道所有其他细节(
https://codepen.io/sheriffderek/pen/2f6bd5956c9f8bd928f957a4f09d8844?editors=0010
我不完全确定问题出在哪里……但继续清理它，把它剥光，直到你找到它的底部。