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import echarts from '../../../ec-canvas/echarts' const app = getApp(); var recipeChart = null; //全局变量 存储动态查询的数据 function initChart(canvas, width, height) { const chart = echarts.init(canvas, null, { width: width, height: height }); canvas.setChart(chart); var option = { color: ["#36648b", "#2eaa8e", "#ffa500"], title: { text: '食物成分分析', left: 'center', textStyle: { fontWeight: 'bold', }, subtext: '总热量 ' + recipeChart.calorie + ' 千卡' }, tooltip: { trigger: 'item', formatter: "{a}\n{b}: {c} ({d}%)" }, legend: { orient: 'vertical', x: 'left', data: ['碳水化合物', '脂肪', '蛋白质'], textStyle: { fontSize: '12', } }, series: [ { name: '主要成分', type: 'pie', radius: '50%', center: ['50%', '60%'], label: { normal: { show: true, position: 'outside', formatter: '{b}', fontSize: 13 }, emphasis: { show: true, textStyle: { fontSize: '13' } } }, data: [ { value: recipeChart.carbohydrate, name: "碳水化合物" }, { value: recipeChart.fat, name: "脂肪" }, { value: recipeChart.protein, name: "蛋白质" } ] } ] } chart.setOption(option); return chart; } Page({ data: { ec: { onInit: initChart } }, getMyData() { wx.request({ url: urlBase + 'url', method: 'POST', data: { repId: rid }, success(res) { // console.log(res.data); recipeChart = res.data; } }); }
6.7 – 再次使用的时候发现无论如何都不渲染 ,跑起来显示都是空白,对比了很久才找到问题。。在此记录一下。
如果发现wxml渲染不了echarts (js写正确的前提下)
<view class="margin-top-lg echart-position">
<ec-canvas id="mychart-dom-line" canvas-id="mychart-line" ec="{{ec}}"></ec-canvas>
</view>
.echart-position {
position:relative;
height: 280px;
overflow:hidden;
}
2.需要在json文件中引入echarts
{
"usingComponents": {
"ec-canvas": "../../../ec-canvas/ec-canvas"
}
}
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