1、引入Chart.js 文件
<script src="Chart.js"></script>
2、在html中创建画布
<canvas id="myChart" width="400" height="400"></canvas>
3、在js中实例化图表
var ctx = $("#myChart").get(0).getContext("2d");
var myNewChart = new Chart(ctx);
不同图表需要new出不同的Chart。
以下是雷达图的实例代码：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>图表插件</title>
<link href="css/bootstrap.css" rel="stylesheet">
<script type="text/javascript" src="js/jquery-1.12.0.min.js"></script>
<script type="text/javascript" src="js/Chart.bundle.js"></script> <script type="text/javascript" src="js/bootstrap.js"></script>
<style>
.top-offset{
margin: 5px 0;
}
</style>
</head>
<body>
<div class="container">
<div class="row top-offset">
<div>
<canvas id="canvas"></canvas>
</div>
</div>
<div class="row">
<div>
<button id="randomizeData">随机数据</button>
<button id="addDataset">添加数据</button>
<button id="removeDataset">移除数据</button>
<button id="addData">添加科目</button>
<button id="removeData">移除科目</button>
</div>
</div>
</div>
<script>
var randomScalingFactor = function() {
return Math.round(Math.random() * 100);
};
var randomColorFactor = function() {
return Math.round(Math.random() * 255);
};
var randomColor = function(opacity) {
return 'rgba(' + randomColorFactor() + ',' + randomColorFactor() + ',' + randomColorFactor() + ',' + (opacity || '.3') + ')';
}; var config = {
type: 'radar',
data: {
labels: ["语文", "数学", "英语", "理综", "基本能力", "体育"],
datasets: [{
label: "一本分数线",
backgroundColor: "rgba(1, 191, 157,0.2)",
pointBackgroundColor: "rgba(31, 207, 109,1)",
data: [122, 125, 118,210,92,95]
},{
label: "二本分数线",
hidden: true,
backgroundColor: "rgba(220,220,220,0.2)",
pointBackgroundColor: "rgba(220,220,220,1)",
data: [115, 110, 105,180,85,86]
}, {
label: '三本分数线',
hidden: true,
data: [90, 85, 98,130,80,82],
}, {
label: "我的成绩",
backgroundColor: "rgba(243,112,33,0.2)",
pointBackgroundColor: "rgba(255,62,62,1)",
hoverPointBackgroundColor: "#fff",
pointHighlightStroke: "rgba(151,187,205,1)",
data: [122, 120, 128,190,90,92]
},]
},
options: {
legend: {
position: 'top',
},
title: {
display: true,
text: '高考成绩雷达图'
},
scale: {
reverse: false,
gridLines: {
color: ['black', 'red', 'orange', 'yellow', 'green', 'blue', 'indigo', 'violet']
},
ticks: {
beginAtZero: true
}
}
}
};
// 实例化雷达图
$(function () {
window.myRadar = new Chart($("#canvas"), config);
}) // 随机数据
$('#randomizeData').click(function() {
$.each(config.data.datasets, function(i, dataset) {
dataset.data = dataset.data.map(function() {
return randomScalingFactor();
}); }); window.myRadar.update();
});
// 添加学生数据
$('#addDataset').click(function() {
var newDataset = {
label: '学生 ' + config.data.datasets.length + " 成绩",
borderColor: randomColor(0.4),
backgroundColor: randomColor(0.5),
pointBorderColor: randomColor(0.7),
pointBackgroundColor: randomColor(0.5),
pointBorderWidth: 1,
data: [],
}; for (var index = 0; index < config.data.labels.length; ++index) {
newDataset.data.push(randomScalingFactor());
} config.data.datasets.push(newDataset);
window.myRadar.update();
});
// 添加课程
$('#addData').click(function() {
if (config.data.datasets.length > 0) {
config.data.labels.push('科目 #' + config.data.labels.length); $.each(config.data.datasets, function (i, dataset) {
dataset.data.push(randomScalingFactor());
}); window.myRadar.update();
}
});
// 移除学生数据
$('#removeDataset').click(function() {
// 删除 splice(数据位置,数据个数)
// config.data.datasets.splice(0, 1);
// pop() 最后一个元素出栈，删除并返回最后一个元素
config.data.datasets.pop();
window.myRadar.update();
});
// 移除课程数据
$('#removeData').click(function() {
config.data.labels.pop(); // remove the label first $.each(config.data.datasets, function(i, dataset) {
dataset.data.pop();
}); window.myRadar.update();
}); </script>
</body> </html>