我正在尝试让 ChartJS 折线图为我正在从事的项目工作。我遵循了一个教程，因为我需要从 mySQL 数据库中获取数据并使用这些数据显示在折线图上。我想知道是否有人有使用 ChartJS 的经验，请告诉我我的代码有什么问题。
出于隐私原因，我删除了指向 JSON 数据的网络链接，但数据以 JSON 格式显示。
<!DOCTYPE html>
<html>
<head>
<title>ChartJS - LineGraph</title>
<style>
.chart-container {
width: 640px;
height: auto;
}
</style>
<!-- javascript -->
<script type="text/javascript" src="js/jquery.min.js"></script>
<script type="text/javascript" src="js/Chart.min.js"></script>
<script type="text/javascript" src="js/linegraph.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.4.0/Chart.min.js"></script>
</head>
<body>
<div class="chart-container">
<canvas id="mycanvas" width="600" height="600"></canvas>
<script>
$(document).ready(function(){
$.ajax({
url : "**********",
type : "GET",
success : function(data){
console.log(data);
var user_id = [];
var pain = [];
var sleep = [];
var mood = [];
var heartrate = [];
var time_of_entry = [];
for(var i in data) {
user_id.push("UserID " + data[i].user_id);
pain.push(data[i].pain);
sleep.push(data[i].sleep);
mood.push(data[i].mood);
heartrate.push(data[i].heartrate);
time_of_entry.push(data[i].timeofentry);
}
var chartdata = {
labels: user_id,
datasets: [
{
label: "pain",
fill: false,
lineTension: 0.1,
backgroundColor: "rgba(59, 89, 152, 0.75)",
borderColor: "rgba(59, 89, 152, 1)",
pointHoverBackgroundColor: "rgba(59, 89, 152, 1)",
pointHoverBorderColor: "rgba(59, 89, 152, 1)",
data: pain
},