javascript ---> [code optimization] complex function into an asynchronous write request for data synchronization && wording

Explanation

Today the structure optimization project, found a following function

const drawMqiPie = async (index) => {
  // 请求的参数
  let params = {
      lineNo: lineNo,
      direct: 1,
      driveway: 1,
      pageNum: 0,
      pageSize: 0,
      computeRange: 3,
      detectDate: $('#detectYear').val() + '-01-01'
  }
  // 请求的url
  let url = conf.URL + 'system/linePqi/list';
  // 调用方法获取数据
  let data = await mar.$post(url, params);
  let pieData = [0, 0, 0, 0, 0];

  // 处理数据
  if (data.code == 200) {
      optionPie.series[0].data = [];
      option.xAxis[0].data = [];
      option.series[0].data = [];
      for (var i = 0; i < data.data.list.length; i++) {
          var everydata = data.data.list[i];
          everydata.mqi = (0.08 * everydata.sci + 0.7 * everydata.pqi + 0.12 * everydata.bci + 0.1 * everydata.tci);
          if (everydata.mqi >= 90) {
              pieData[0] = pieData[0] + parseFloat(everydata.endNum - everydata.startNum);
          } else if (everydata.mqi > 80) {
              pieData[1] = pieData[1] + parseFloat(everydata.endNum - everydata.startNum);
          } else if (everydata.mqi > 70) {
              pieData[2] = pieData[2] + parseFloat(everydata.endNum - everydata.startNum);
          } else if (everydata.mqi > 60) {
              pieData[3] = pieData[3] + parseFloat(everydata.endNum - everydata.startNum);
          } else {
              pieData[4] = pieData[4] + parseFloat(everydata.endNum - everydata.startNum);
          }
      }
      optionPie.series[0].data.push({ value: pieData[0] / 1000, name: '优', itemStyle: { color: colors[0], fontSize: 18 } });
      optionPie.series[0].data.push({ value: pieData[1] / 1000, name: '良', itemStyle: { color: colors[1], fontSize: 18 } });
      optionPie.series[0].data.push({ value: pieData[2] / 1000, name: '中', itemStyle: { color: colors[2], fontSize: 18 } });
      optionPie.series[0].data.push({ value: pieData[3] / 1000, name: '次', itemStyle: { color: colors[3], fontSize: 18 } });
      optionPie.series[0].data.push({ value: pieData[4] / 1000, name: '差', itemStyle: { color: colors[4], fontSize: 18 } });
      optionPie.title.text = "公路技术状况MQI饼状图";
      mar.echarts.draw($dom, optionPie);
      layer.close(index);
  }
}

Note:
1. The above function is to call echarts drawing functions, draw a pie chart
2. Though comments written more clearly, but a few days later to see, or will bring some dyslexia.

optimization

• The following start optimizing
• Read function it can be found that the 3-point drawing function is divided into
  1. Get Data: Data comprising, and Option
  2. Data processing: based on the data request back Ajax, change Option
  3. Paint: The final draw and Option Dom.
• After the function changes as follows

// 画折线图
const drawLine = async (index) => {
	// 获取数据
	let { data, optionLine } = await getLineData();
	// 处理数据
	optionLine = handleLineData(data, optionLine);
	// 画图
	mar.echarts.draw($domLine, optionLine);
	// 关闭加载页面
	layer.close(index);
}

• When you see something like the above function of time, it is not it feel less panicked,
• In fact, to do a little bit of improvement.

Synchronous writing asynchronous data request

• Write general method Mar classes inside.
• Mainly for jquerythe $postencapsulation method:

class Mar {
	constructor( conf ){
		const { jquery } = conf;
		this.$ = jquery;
	}
	async $post (url, params) {
		// 调用jquery的ajax方法
		return this.$.post(url, params, '', 'json');
	}
}

• This method is called

const Mar = require('./Mar');
const jequery = require('./jequery');
const mar = new Mar({ jequery });
const url = 'http://xxx:port/path';
const params = {
	pageSize: 0,
	pageNo: 0
};

let data = await mar.$post(url, params);
console.log(data);

Description:
In this way, can be very elegant asynchronous callback method in order to get rid of hell. Make the program look more beautiful, more convenient follow-up to read and maintain.