"use script" // 开发环境建议开启严格模式
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const url = "https://api.waqi.info/mapq/bounds/?bounds={RECTANGLE}&inc=placeholders&k={KEY}&_={DATA}"
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const table = [
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{
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level: "一级（优）",
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influence: "空气质量令人满意，基本无空气污染",
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suggestion: "各类人群可正常活动"
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},
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{
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level: "二级（良）",
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influence: "空气质量可接受，但某些污染物可能对极少数异常敏感人群健康有较弱影响",
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suggestion: "心脏病和肺病患者症状显著加剧，运动耐受力降低，健康人群普遍出现症状"
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},
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{
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level: "三级（轻度污染）",
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influence: "易感人群症状有轻度加剧，健康人群出现刺激症状",
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suggestion: "儿童、老年人及心脏病、呼吸系统疾病患者应减少长时间、高强度的户外锻炼"
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},
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{
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level: "四级（中度污染）",
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influence: "易感人群症状有轻度加剧，健康人群出现刺激症状",
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suggestion: "儿童、老年人及心脏病、呼吸系统疾病患者避免长时间、高强度的户外锻炼，一般人群适量减少户外运动"
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},
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{
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level: "五级（重度污染）",
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influence: "心脏病和肺病患者症状显著加剧，运动耐受力降低，健康人群普遍出现症状",
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suggestion: "儿童、老年人及心脏病、肺病患者应停留在室内，停止户外运动，一般人群减少户外运动"
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},
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{
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level: "六级（严重污染）",
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influence: "心脏病和肺病患者症状显著加剧，运动耐受力降低，健康人群普遍出现症状",
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suggestion: "儿童、老年人和病人应停留在室内，避免体力消耗，一般人群避免户外活动"
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}
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]
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let xmlHttpRequest
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const nWidth = 500
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let currTime
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onmessage = function (e) {
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const bounds = e.data.bounds
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currTime = new Date().getTime()
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const strKey = jskey()
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const nowUrl = url.replace("{RECTANGLE}", bounds).replace("{KEY}", strKey).replace("{DATA}", currTime)
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xmlHttpRequest = new XMLHttpRequest()
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// 2.设置回调函数
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xmlHttpRequest.onreadystatechange = callback
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// 3.初始化XMLHttpRequest组建
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xmlHttpRequest.open("POST", nowUrl, true)
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// 4.发送请求
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xmlHttpRequest.send()
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}
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function callback() {
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if (xmlHttpRequest.readyState === 4 && xmlHttpRequest.status === 200) {
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const entityTable = []
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/// /////////////////////////////////////////////////
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const currentData = JSON.parse(xmlHttpRequest.responseText)
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for (let i = currentData.length - 1; i >= 0; i--) {
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const item = currentData[i]
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let aqi = parseInt(item.aqi)
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if (!isNumber(aqi)) {
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continue
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}
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let level = 0
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if (aqi > nWidth) {
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level = 5
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aqi = nWidth - 1
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} else {
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if (aqi > 300) {
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level = 5
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} else if (aqi > 200) {
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level = 4
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} else if (aqi > 150) {
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level = 3
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} else if (aqi > 100) {
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level = 2
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} else if (aqi > 50) {
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level = 1
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}
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}
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const newItem = {
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...item,
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aqi: aqi,
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level: table[level].level,
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influence: table[level].influence,
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suggestion: table[level].suggestion
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}
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entityTable.push(newItem)
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}
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/// ///////////////////////////////////////////////////
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// self代表子线程自身
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self.postMessage({ currTime: currTime, entityTable: entityTable })
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self.close()
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} else if (xmlHttpRequest.readyState === 4 && xmlHttpRequest.status === 0) {
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self.postMessage({ currTime: currTime, entityTable: [] })
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self.close()
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}
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}
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function isNumber(obj) {
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return typeof obj === "number" && !isNaN(obj)
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}
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function jskey() {
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return (function () {
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let u = ""
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decodeURIComponent("%603Z3F%7BWS%3A3BSBdIRlJTySXYnmecFR%2CF%7BeSGHhkMh%3E%3E")
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.split("")
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.forEach(function (c) {
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u += String.fromCharCode(c.charCodeAt(0) - 1)
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})
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return u
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})()
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}
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