Chart.js使用教程

1、首先我们需要在页面中引入Chart.js文件。此工具库在全局命名空间中定义了Chart变量。<script src="Chart.js"></script>

2、为了创建图表，我们要实例化一个canvas<canvas id="canvas" height="350" width="350"></canvas>

3、我们还可以用jQuery获取canvas的context。首先从jQuery集合中获取我们需要的DOM节点，然后在这个DOM节点上调用getContext("2d")方法。var ctx = document.getElementById("canvas").getContext("2d"); myNewChart_4 = new Chart(ctx).Doughnut(doughnutData, doughnutOptions);

4、定义doughnutOptionsvar doughnutOptions = { //Boolean - Whether we should show a stroke on each segment segmentShowStroke : true, //String - The colour of each segment stroke segmentStrokeColor : "#fff", //Number - The width of each segment stroke segmentStrokeWidth : 2, //Number - The percentage of the chart that we cut out of the middle percentageInnerCutout : 50, // This is 0 for Pie charts //Number - Amount of animation steps animationSteps : 100, //String - Animation easing effect animationEasing : "easeOutBounce", //Boolean - Whether we animate the rotation of the Doughnut animateRotate : true, //Boolean - Whether we animate scaling the Doughnut from the centre animateScale : true, //Boolean - Re-draw chart on page resize responsive: false, };

5、定义doughnutDatavar doughnutData = [ { value多唉捋胝: 300, color: "rgba(220,220,220,0.8)", highlight: "rgba(220,220,220,0.7)", label: "Grey" }, { value: 50, color: "rgba(151,187,205,1)", highlight: "rgba(151,187,205,0.8)", label: "Blue" }, { value: 100, color: "rgba(169, 3, 41, 0.7)", highlight: "rgba(169, 3, 41, 0.7)", label: "Red" } ];

6、完成圆形