HTML chartjs如何自适应屏幕,关于chartjs表格的大小问题

我创建出来的表格总是和自定义的canvas大小无关呢

//html

//js(这就是官网的示例)

var ctx = $('#chartTest')[0].getContext('2d');

var chart = new Chart(ctx,{

type: 'bar',

data: {

labels: ["Red", "Blue", "Yellow", "Green", "Purple", "Orange"],

datasets: [{

label: '# of Votes',

data: [12, 19, 3, 5, 2, 3],

backgroundColor: [

'rgba(255, 99, 132, 0.2)',

'rgba(54, 162, 235, 0.2)',

'rgba(255, 206, 86, 0.2)',

'rgba(75, 192, 192, 0.2)',

'rgba(153, 102, 255, 0.2)',

'rgba(255, 159, 64, 0.2)'

],

borderColor: [

'rgba(255,99,132,1)',

'rgba(54, 162, 235, 1)',

'rgba(255, 206, 86, 1)',

'rgba(75, 192, 192, 1)',

'rgba(153, 102, 255, 1)',

'rgba(255, 159, 64, 1)'

],

borderWidth: 1

}]

},

options: {

scales: {

yAxes: [{

ticks: {

beginAtZero:true

}

}]

}

}

})

图表显示了，但属性却是这样的：

canvas的宽高和我自定义的完全无关呢

请问哪里出错了吗