shanxian-work-app/pages/mine/uchart/curve.vue

<template>
	<view class="qiun-columns">
		<!--#ifdef H5 -->
		<view class="qiun-bg-white qiun-title-bar qiun-common-mt" >
			<view class="qiun-title-dot-light">页面地址</view>
		</view>
		<view class="qiun-bg-white qiun-padding">
		    <text>pages/basic/line/curve</text>
		</view>
		<!--#endif-->
		<view class="qiun-bg-white qiun-title-bar qiun-common-mt" >
			<view class="qiun-title-dot-light">基本曲线图</view>
		</view>
		<view class="qiun-charts" >
			<!--#ifdef MP-ALIPAY -->
			<canvas canvas-id="canvasLineA" id="canvasLineA" class="charts" :width="cWidth*pixelRatio" :height="cHeight*pixelRatio" :style="{'width':cWidth+'px','height':cHeight+'px'}" @touchstart="touchLineA"></canvas>
			<!--#endif-->
			<!--#ifndef MP-ALIPAY -->
			<canvas canvas-id="canvasLineA" id="canvasLineA" class="charts" @touchstart="touchLineA"></canvas>
			<!--#endif-->
		</view>
		<!--#ifdef H5 -->
		<view class="qiun-bg-white qiun-title-bar qiun-common-mt" >
			<view class="qiun-title-dot-light">标准数据格式</view>
		</view>
		<view class="qiun-bg-white qiun-padding">
		    <textarea class="qiun-textarea" auto-height="true" maxlength="-1" v-model="textarea"/>
		</view>
		<view class="qiun-text-tips">Tips：修改后点击更新图表</view>
		<button class="qiun-button" @tap="changeData()">更新图表</button>
		<!--#endif-->
	</view>
</template>

<script>
	import uCharts from '@/components/u-charts/u-charts.js';
	import  { isJSON } from '@/common/checker.js';
	
	var _self;
	var canvaLineA=null;
	export default {
		data() {
			return {
				cWidth:'',
				cHeight:'',
				pixelRatio:1,
				textarea:''
			}
		},
		onLoad() {
			_self = this;
			//#ifdef MP-ALIPAY
			uni.getSystemInfo({
				success: function (res) {
					if(res.pixelRatio>1){
						//正常这里给2就行，如果pixelRatio=3性能会降低一点
						//_self.pixelRatio =res.pixelRatio;
						_self.pixelRatio =2;
					}
				}
			});
			//#endif
			this.cWidth=uni.upx2px(750);
			this.cHeight=uni.upx2px(500);
			this.getServerData();
		},
		methods: {
			getServerData(){
				uni.request({
					url: 'https://www.ucharts.cn/data.json',
					data:{
					},
					success: function(res) {
						console.log(res.data.data)
						let LineA={categories:[],series:[]};
						//这里我后台返回的是数组，所以用等于，如果您后台返回的是单条数据，需要push进去
						LineA.categories=res.data.data.LineA.categories;
						LineA.series=res.data.data.LineA.series;
						_self.textarea = JSON.stringify(res.data.data.LineA);
						_self.showLineA("canvasLineA",LineA);
					},
					fail: () => {
						_self.tips="网络错误，小程序端请检查合法域名";
					},
				});
			},
			showLineA(canvasId,chartData){
				canvaLineA=new uCharts({
					$this:_self,
					canvasId: canvasId,
					type: 'line',
					fontSize:11,
					padding:[15,20,0,15],
					legend:{
						show:true,
						padding:5,
						lineHeight:11,
						margin:0,
					},
					dataLabel:true,
					dataPointShape:true,
					background:'#FFFFFF',
					pixelRatio:_self.pixelRatio,
					categories: chartData.categories,
					series: chartData.series,
					animation: true,
					xAxis: {
						type:'grid',
						gridColor:'#CCCCCC',
						gridType:'dash',
						dashLength:8,
            boundaryGap:'justify'
					},
					yAxis: {
						gridType:'dash',
						gridColor:'#CCCCCC',
						dashLength:8,
						splitNumber:5,
						format:(val)=>{return val.toFixed(0)+'元'}
					},
					width: _self.cWidth*_self.pixelRatio,
					height: _self.cHeight*_self.pixelRatio,
					extra: {
						line:{
							type: 'curve'
						}
					}
				});
				//下面是默认选中索引
				let cindex=3;
				//下面是自定义文案
				let textList=[{text:'我是一个标题',color:null},{text:'自定义1：值1',color:'#2fc25b'},{text:'自定义2：值2',color:'#facc14'},{text:'自定义3：值3',color:'#f04864'}];
				//下面是event的模拟,tooltip的Y坐标值通过这个mp.changedTouches[0].y控制
				let tmpevent={mp:{changedTouches:[{x: 0, y: 80}]}};
				setTimeout(()=>{
					canvaLineA.showToolTip( tmpevent , {
						index:cindex,
						textList:textList
					});
				},200)
			},
			touchLineA(e) {
				canvaLineA.touchLegend(e);
				canvaLineA.showToolTip(e, {
					format: function (item, category) {
						return category + ' ' + item.name + ':' + item.data 
					}
				});
			},
			changeData(){
				if(isJSON(_self.textarea)){
					let newdata=JSON.parse(_self.textarea);
					canvaLineA.updateData({
						series: newdata.series,
						categories: newdata.categories
					});
				}else{
					uni.showToast({
						title:'数据格式错误',
						image:'../../../static/images/alert-warning.png'
					})
				}
			}
		}
	}
</script>

<style>
	/*样式的width和height一定要与定义的cWidth和cHeight相对应*/
	.qiun-charts {
		width: 750upx;
		height: 500upx;
		background-color: #FFFFFF;
	}
	
	.charts {
		width: 750upx;
		height: 500upx;
		background-color: #FFFFFF;
	}
</style>