本文实例为大家分享了JS实现天气预报的具体代码，供大家参考，具体内容如下

HTML代码

 
 
 
 
 
 


 
 
 Tq
 
 
 
 
 
 
  历史查询
  
 
 
 
 
 
  清除历史记录
 
 
 
 

 
 
 

 
 
 
  生活指数
  
  
   
   舒适度指数
  
  
   
   穿衣指数
  
  
   
   感冒指数
  
  
   
   运动指数
  
  
   
   旅游指数
  
  
   
   紫外线指数
  
  
   
   洗车指数
  
  
   
   空气污染扩散条件指数
  
  
 
 
 
 
 
 
 

CSS代码

* {
 margin: 0;
 padding: 0;
}
ul,li {
 list-style: none;
}
body {
 background-size: 120%;
 color: white;
}
.search {
 position: fixed;
 width: 100%;
 height: 0.5rem;
 background-color: rgba(0,0,0,.0);
 display: flex;
 justify-content: space-between;
 align-items: center;
}
#search_from {
 width: 2.8rem;
 height: 0.4rem;
 position: relative;
}
.search > span {
 width: 0.5rem;
 font-size: 0.25rem;
 line-height: 0.5rem;
 text-align: center;
 font-family: "Segoe UI Symbol";
 color: white;
}
.search #search_from > input {
 width: 2.8rem;
 height: 0.4rem;
 border-radius: 0.1rem;
 text-indent: 0.1rem;
 outline: none;
 position: absolute;
 border: none;
 border-bottom: 0.01rem solid white;
 background-color: rgba(255,255,255,.05);
 color: white;
}
.search #search_from > input::-webkit-input-placeholder {
 color: white;
}
.search > .search-btn {
 width: 0.5rem;
 position: relative;
}
.search > .search-btn > img {
 width: 0.25rem;
 position: absolute;
 top: 50%;
 left: 50%;
 transform: translate(-50%,-50%);
}
.history {
 height: 0.9rem;
 overflow: auto;
 background-color: rgba(255,255,255,.05);
 transition-duration: 0.5s;
}
.historys {
 margin-top: 0.8rem;
 overflow: hidden;
}
.history .history-item {
 display: flex;
 height: 0.4rem;
 border-bottom: 0.01rem dashed #cccccc;
 align-items: center;
 justify-content: space-evenly;
}
.history .history-item > .history-time {
 font-size: 0.14rem;
}
.history .history-item > .history-city {
 font-size: 0.18rem;
}
.history .la {
 height: 0.3rem;
 display: flex;
 position: fixed;
 top: 0.45rem;
 width: 90%;
 background-color: rgba(255,255,255,.0);
 justify-content: space-between;
 font-size: 0.16rem;
 border-bottom: 0.01rem solid white;
 margin: 0.1rem 0.2rem;
 font-family: 幼圆;
 line-height: 0.3rem;
}
.history .la > span {
 color: white;
}
.history .la > img {
 width: 0.2rem;
 height: 0.2rem;
 padding: 0.03rem;
 border: 0.01rem solid #cccccc;
 border-radius: 0.05rem;
}
.clearbtn {
 height: 0.3rem;
 text-align: center;
 text-decoration: underline;
 font-size: 0.2rem;
 margin-top: 0.1rem;
 line-height: 0.3rem;
}
.information {
 
}
.now {
 padding-top: 0.2rem;
 display: flex;
 flex-direction: column;
}
.now .city {
 font-size: 0.4rem;
 text-align: center;
}
.now .situation {
 padding-top: 0.2rem;
 display: flex;
 justify-content: space-evenly;
 font-size: 0.15rem;
 align-items: center;
}
.now .situation > img {
 width: 1rem;
 height: 1rem;
 vertical-align: bottom;
}
.now .temp {
 display: flex;
 flex-direction: column;
 align-items: center;
}
.now .temp > h3 {
 font-size: 0.2rem;
 margin-top: 0.1rem;
}
.forecast {
 background-color: rgba(0,0,0,.3);
 margin: 0 0.2rem;
 border-radius: 0.1rem;
}
.forecast-item {
 height: 0.3rem;
 display: flex;
 justify-content: space-between;
 margin: 0.1rem 0.2rem 0;
 padding-top: 0.1rem;
}
.forecast-item:last-of-type {
 padding-bottom: 0.1rem;
}
.forecast-item .forecast-situation > img {
 width: 0.2rem;
 height: 0.2rem;
}
.forecast-item .forecast-situation {
 font-size: 0.16rem;
}
.forecast-temp {
 font-size: 0.18rem;
}
.lifestyle {
 display: none;
 margin: 0 0.2rem;
 background-color: rgba(0,0,0,.3);
 border-radius: 0.1rem;
}
.lifestyle > h2 {
 text-align: center;
 margin-top: 0.2rem;
 font-size: 0.2rem;
 padding-top: 0.15rem;
 font-family: 幼圆;
}
.lifestyle .lifestyle-box {
 display: flex;
 flex-wrap: wrap;
 justify-content: space-between;
}
.lifestyle .lifestyle-box .lifestyle-item {
 display: flex;
 flex-direction: column;
 width: 0.7rem;
 height: 0.4rem;
 font-size: 0.14rem;
 text-align: center;
 padding-top: 0.1rem;
 padding-bottom: 0.05rem;

}
.lifestyle .lifestyle-box .lifestyle-item > i {
 font-size: 0.2rem;
}
.lifestyle .lifestyle-box .lifestyle-item > span {
 white-space: nowrap;
 text-overflow:ellipsis;
 overflow:hidden;
}
.lifestyle-tc {
 height: 100vh;
 position: fixed;
 top: 0;
 left: 0;
 background-color: gold;
 font-family: 幼圆;
 line-height: 0.4rem;

}
.lifestyle-tc .fanghui {
 width: 0.3rem;
 height: 0.3rem;
 position: absolute;
 left: 0.2rem;
 top: 0.1rem;
}
.lifestyle-tc .fanghui > img {
 width: 100%;
}
.lifestyle-tc > h2 {
 font-size: 0.3rem;
 width: 2.2rem;
 margin: 0.3rem auto 0;
 text-align: center;
}
.lifestyle-tc > span {
 width: 100%;
 font-size: 0.2rem;
 margin-top: 1.5rem;
 display: block;
 font-weight: 700;
 text-indent: 0.16rem;
}
.lifestyle-tc > p {
 text-indent: 0.32rem;
 font-size: 0.2rem;
}

JS代码

let searchtext = document.querySelector('.search #search_from > input');
let searchbtn = document.querySelector('.search-btn');
let information = document.querySelector('.information'); //当前天气div
let forecast = document.querySelector(".forecast"); //获取天气预报 div
let lifestyle = document.querySelector('.lifestyle');
 if (localStorage.tq == undefined) { 
 var tqList = [];
 let defauleCity = "普宁";
 autorend(defauleCity);
 } else { 
 var tqList = JSON.parse(localStorage.tq);
 let endcityName = tqList[tqList.length - 1].cityName;
 autorend(endcityName);
}

 
 function autorend (cityName) {
 let nowurl = "https://free-api.heweather.net/s6/weather/now?location="+cityName+"&key=26be256aca2c43a7bb7f9a72e0f99a6b";
 let dailyurl = "https://free-api.heweather.net/s6/weather/forecast?location="+cityName+"&key=26be256aca2c43a7bb7f9a72e0f99a6b";
 let lifestyleurl = "https://free-api.heweather.net/s6/weather/lifestyle?location="+cityName+"&key=26be256aca2c43a7bb7f9a72e0f99a6b";
 console.log("执行自动渲染")
 rendweather(nowurl,cityName,dailyurl,lifestyleurl);
}

 function getTime() {
 let date = new Date();
 let year = date.getFullYear();
 let month = date.getMonth() + 1;
 let day = date.getDate();
 let house = date.getHours();
 house = house < 10 ? '0' + house : house;
 let minutes = date.getMinutes();
 minutes = minutes < 10 ? '0' + minutes : minutes;
 let second = date.getMinutes();
 second = second < 10 ? '0' + second : second;
 let time = year + "年 - " + month + "月 - " + day + "日 - " + house + ":" + minutes + ":" + second;
 return time;
 }

 
 searchbtn.addEventListener('click',function () {
 let time = getTime();
 let cityName = searchtext.value;
 
 if (cityName != "") {
 let List = {
  "cityName" : cityName,
  "time" : time
 }
 tqList.push(List);
 localStorage.tq = JSON.stringify(tqList);
 rendhistory(tqList);
 let nowurl = "https://free-api.heweather.net/s6/weather/now?location="+cityName+"&key=26be256aca2c43a7bb7f9a72e0f99a6b";
 let dailyurl = "https://free-api.heweather.net/s6/weather/forecast?location="+cityName+"&key=26be256aca2c43a7bb7f9a72e0f99a6b";
 let lifestyleurl = "https://free-api.heweather.net/s6/weather/lifestyle?location="+cityName+"&key=26be256aca2c43a7bb7f9a72e0f99a6b";
 rendweather(nowurl,cityName,dailyurl,lifestyleurl); 
 searchtext.value = "";
 }
});

 
 document.getElementById('search_from').onsubmit = function () {
 searchbtn.click();
 document.activeElement.blur();
 }

 
 function rendweather (nowurl,cityName,dailyurl,lifestyleurl) {
 
 getAjax(nowurl,function (xhr) {
  let databoj = JSON.parse(xhr.response);
  let now = databoj.HeWeather6[0].now;
  if (now == undefined) { 
  if (tqList.length > 1) {//如果长度大于1 说明之前用户正确输入过城市
   tqList.splice(tqList.length - 1 , 1 ); //执行删除最后一个元素 即输入错误的城市
   rendhistory(tqList); // 执行历史记录渲染
   cityName = tqList[tqList.length - 1].cityName; //将城市名赋值为数组最后一个元素 即最后一次正确搜索的城市
  } else if (tqList.length == 1) { 
   cityName = "普宁"; //将城市名赋值为 普宁
   // tqList.splice(tqList.length - 1 , 1 );
   tqList.pop(); //删除输入错误的文字
   rendhistory(tqList); //执行历史记录渲染
  }
  autorend(cityName); //最后执行自动渲染
  } else { //如果以上都没错误 说明用户输入的城市正确 正常执行代码
  
  information.innerHTML = `
  
  ${cityName}
  
   
  
${now.cond_txt} 
  
   
温度:${now.tmp}℃ 
   
体感温度:${now.fl}℃  
  
  
 `;
  
  let nowcondtxt = now.cond_code;
  switch(nowcondtxt) {
   case "101":
   case "102":
   case "103":
   case "104":
   document.body.style.backgroundImage = "url('images/2.jpg')";
   break;
   case "100":
   case "200":
   case "201":
   case "202":
   case "203":
   case "204":
   document.body.style.backgroundImage = "url('images/1.jpg')";
   break;
   case "205":
   case "206":
   case "207":
   case "208":
   case "209":
   document.body.style.backgroundImage = "url('images/7.jpg')";
   break;
   case "210":
   case "211":
   case "212":
   case "213":
   document.body.style.backgroundImage = "url('images/8.jpg')";
   break;
   case "300":
   case "301":
   case "302":
   case "303":
   case "304":
   case "305":
   case "306":
   case "307":
   case "308":
   case "309":
   case "310":
   case "311":
   case "312":
   case "313":
   case "314":
   case "315":
   case "316":
   case "317":
   case "318":
   case "399":
   document.body.style.backgroundImage = "url('images/3.jpg')";
   break;
   case "400":
   case "401":
   case "402":
   case "403":
   case "404":
   case "405":
   case "406":
   case "407":
   case "408":
   document.body.style.backgroundImage = "url('images/4.jpg')";
   break;
   case "500":
   case "501":
   case "502":
   case "503":
   case "504":
   case "505":
   case "506":
   case "507":
   case "508":
   document.body.style.backgroundImage = "url('images/5.jpg')";
   break;
   case "509":
   case "510":
   case "511":
   case "512":
   case "513":
   case "514":
   case "515":
   document.body.style.backgroundImage = "url('images/6.jpg')";
   break;
   default:
   document.body.style.backgroundImage = "url('images/9.jpg')";
  }

  
  getAjax(dailyurl,function (xhr) {
   forecast.innerHTML = ""; 
   let databoj = JSON.parse(xhr.response);
   let daily = databoj.HeWeather6[0].daily_forecast;
   daily.forEach(function (item,index) {
   
   var txt = item.cond_txt_d == item.cond_txt_n ? item.cond_txt_d : item.cond_txt_d + "转" + item.cond_txt_n;
   let date = '今天'; 
   if (index == 1) { 
    date = "明天";
   } else if (index == 2) { 
    date = "后天";
   }
   
   forecast.innerHTML += `
   
    
    
    ${date} * ${txt}
   
    
    ${item.tmp_max}°/
    ${item.tmp_min}°
    
  `;
   })
  });

  lifestyle.style.display = 'block'; 
  
  getAjax(lifestyleurl,function (xhr) {
   let databoj = JSON.parse(xhr.response);
   let lifestyle = databoj.HeWeather6[0].lifestyle;
   lifestyleclick(lifestyle); 
  });
  }
 });
 }

 
 let lifestyleitem = document.querySelectorAll('.lifestyle-item');
 function lifestyleclick (lifestyle) {
 for (let j = 0; j < lifestyleitem.length; j ++) {
  lifestyleitem[j].onclick = function () {
  let index = lifestyleitem[j].dataset.indexs;
  let li = lifestyle[index];
  let lifestyletc = document.querySelector('.lifestyle-tc');
  lifestyletc.innerHTML = `
    
      
    ${lifestyleitem[j].children[1].childNodes[0].data}
    ${li.brf}
    
"${li.txt}"
`;
  lifestyletc.style.display = 'block';
  
  let fanghuibtn = document.querySelector('.fanghui');
  console.log(fanghuibtn);
  fanghuibtn.onclick = function () {
   lifestyletc.style.display = 'none';
  }
  }
 }
 }


 //历史记录事件
 let historys = document.querySelector('.historys');
 function rendhistory(tqList) {
 historys.innerHTML = ""; 
 tqList.forEach(function (item,index) {
  
  historys.innerHTML += `
  
  ${item.time}
  ${item.cityName}
  
  `;
 })

 
 let historyitem = document.querySelectorAll('.history-item');
 for (let j = 0; j < historyitem.length; j ++) {
  historyitem[j].onclick = function() {
  let index = historyitem[j].dataset.indexs;
  let thecityName = tqList[index].cityName;
  let time = getTime();
  let List = {
   "cityName" : thecityName,
   "time" : time
  }
  tqList.push(List);
  localStorage.tq = JSON.stringify(tqList);
  rendhistory(tqList);
  autorend(thecityName);
  }
 }
 }
 rendhistory(tqList);
 xiala();
 //下拉菜单事件
 function xiala () {
 let historybtn = document.querySelector('.la > img');
 let historyDiv = document.querySelector('.history');
 let clearhistory = document.querySelector('.clearbtn');
 let flag = true;
 historybtn.addEventListener('click',function () {
  if (flag) {
  flag = false;
  historybtn.style.backgroundColor = "rgba(0,0,0,.3)";
  let height = (tqList.length * 0.4) + 1.7;
  historyDiv.style.height = height + 'rem';
  } else {
  flag = true;
  historybtn.style.backgroundColor = "rgba(0,0,0,.0)";
  historyDiv.style.height = '0.9rem';
  }
 });
 clearhistory.addEventListener('click',function () { 
  localStorage.removeItem('tq'); 
  tqList = []; 
  rendhistory(tqList); 
  historybtn.click(); 
 });
 searchtext.addEventListener('click',function () { //点击输入框 如果下拉菜单打开 就关闭
  if (!flag) {
  historybtn.click();
  }
 });
 }

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持考高分网。