文章目录
一、百度地图AK密钥申请二、调用百度地图API生成热力图三、调用百度地图API自动获取经纬度和地址一、百度地图AK密钥申请
点击百度地图API控制台，输入登录账户，即可进入，若账户未完成验证，请先完成验证。之后点击控制台–>我的应用–>新建应用完成AK密钥申请。
提交成功之后可看到AK密钥，复制下来替换下面代码中的ak=您的AK 字段即可
二、调用百度地图API生成热力图
这里先给出效果图：
其中的数据有文件需求的可以用JavaScript导入csv文件方式进行处理。若出现百度未授权使用地图API，可能是因为您提供的密钥不是有效的百度LBS开放平台密钥…
点击百度地图开放平台进行解决。
<!DOCTYPE html><html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><meta name="viewport" content="initial-scale=1.0, user-scalable=no" /><script type="text/javascript" src="http://api./api?v=2.0&ak=你的AK"></script><script type="text/javascript" src="http://api./library/Heatmap/2.0/src/Heatmap_min.js"></script><title>热力图功能示例</title><style type="text/css">ul,li{list-style: none;margin:0;padding:0;float:left;}html{height:100%}body{height:100%;margin:0px;padding:0px;font-family:"微软雅黑";}#container{height:500px;width:100%;}#r-result{width:100%;}</style></head><body><div id="container"></div><div id="r-result"><input type="button" onclick="openHeatmap();" value="显示热力图"/><input type="button" onclick="closeHeatmap();" value="关闭热力图"/></div></body></html><script type="text/javascript">var map = new BMap.Map("container");// 创建地图实例var point = new BMap.Point(103.960513,30.784031);map.centerAndZoom(point, 17); // 初始化地图，设置中心点坐标和地图级别map.enableScrollWheelZoom(); // 允许滚轮缩放var points =[{"lng":103.958106,"lat":30.786079,"count":50},{"lng":103.960297,"lat":30.787661,"count":51},{"lng":103.961339,"lat":30.781177,"count":100},{"lng":103.961539,"lat":30.781177,"count":40},{"lng":103.961375,"lat":30.781255,"count":100},{"lng":103.962339,"lat":30.781177,"count":100},{"lng":103.961465,"lat":30.780696,"count":90},{"lng":103.961339,"lat":30.781177,"count":80},{"lng":103.961329,"lat":30.781177,"count":11},{"lng":103.961359,"lat":30.781177,"count":7},{"lng":103.961349,"lat":30.781177,"count":42},{"lng":103.962133,"lat":30.782454,"count":4},{"lng":103.962133,"lat":30.782454,"count":27},{"lng":103.963531,"lat":30.786699,"count":100},{"lng":103.963531,"lat":30.786699,"count":46},{"lng":103.955087,"lat":30.780665,"count":80},{"lng":103.961771,"lat":30.781317,"count":80},{"lng":103.961645,"lat":30.781332,"count":220},{"lng":103.961878,"lat":30.781022,"count":300},{"lng":103.961519,"lat":30.780758,"count":50},{"lng":103.961573,"lat":30.780665,"count":150},{"lng":103.961447,"lat":30.780743,"count":123},{"lng":103.961052,"lat":30.780929,"count":231},{"lng":103.960854,"lat":30.781146,"count":80}];if(!isSupportCanvas()){alert('热力图目前只支持有canvas支持的浏览器,您所使用的浏览器不能使用热力图功能~')}//详细的参数,可以查看heatmap.js的文档 /pa7/heatmap.js/blob/master/README.md//参数说明如下:/* visible 热力图是否显示,默认为true* opacity 热力的透明度,1-100* radius 势力图的每个点的半径大小 * gradient {JSON} 热力图的渐变区间 . gradient如下所示*{.2:'rgb(0, 255, 255)',.5:'rgb(0, 110, 255)',.8:'rgb(100, 0, 255)'}其中 key 表示插值的位置, 0~1. value 为颜色值. */heatmapOverlay = new BMapLib.HeatmapOverlay({"radius":20});map.addOverlay(heatmapOverlay);heatmapOverlay.setDataSet({data:points,max:100});//是否显示热力图function openHeatmap(){heatmapOverlay.show();}function closeHeatmap(){heatmapOverlay.hide();}closeHeatmap();function setGradient(){/*格式如下所示:{0:'rgb(102, 255, 0)',.5:'rgb(255, 170, 0)',1:'rgb(255, 0, 0)'}*/var gradient = {};var colors = document.querySelectorAll("input[type='color']");colors = [].slice.call(colors,0);colors.forEach(function(ele){gradient[ele.getAttribute("data-key")] = ele.value; });heatmapOverlay.setOptions({"gradient":gradient});}//判断浏览区是否支持canvasfunction isSupportCanvas(){var elem = document.createElement('canvas');return !!(elem.getContext && elem.getContext('2d'));}</script>
三、调用百度地图API自动获取经纬度和地址
效果图如下：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="/1999/xhtml"><head><title>点击地图获取地址和经纬度map，address，lng，lat</title><meta name="robots" content="noindex, nofollow"><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><!-- 将百度地图API引入，设置好自己的key --><script type="text/javascript" src="http://api./api?v=2.0&ak=你的AK"></script></head><body><div class="main-div"><form method="post" action="" name="theForm" enctype="multipart/form-data" onsubmit="return validate()"><table cellspacing="1" cellpadding="3" width="100%"><tr><td class="label">经度</td><td><input type="text" name="lng" id="lng" value="" /></td></tr><tr><td class="label">纬度</td><td><input type="text" name="lat" id="lat" value="" /></td></tr><tr><td class="label">地址</td><td><input type='text' value='' name='sever_add' id='sever_add'><input type='button' value='点击显示地图获取地址经纬度' id='open'></td></tr></table></form><div id='allmap' style='width: 100%; height: 100%; position: absolute; display: none'></div></div></body><script type="text/javascript">function validate() {var sever_add = document.getElementsByName('sever_add')[0].value;if (isNull(sever_add)) {alert('请选择地址');return false;}return true;}//判断是否是空 function isNull(a) {return (a == '' || typeof(a) == 'undefined' || a == null) ? true : false;}document.getElementById('open').onclick = function() {if (document.getElementById('allmap').style.display == 'none') {document.getElementById('allmap').style.display = 'block';} else {document.getElementById('allmap').style.display = 'none';}}var map = new BMap.Map("allmap");var geoc = new BMap.Geocoder(); //地址解析对象 var markersArray = [];var geolocation = new BMap.Geolocation();var point = new BMap.Point(103.961539,30.781177);map.centerAndZoom(point, 17); // 中心点以及级别geolocation.getCurrentPosition(function(r) {if (this.getStatus() == BMAP_STATUS_SUCCESS) {var mk = new BMap.Marker(r.point);map.addOverlay(mk);map.panTo(r.point);map.enableScrollWheelZoom(true);} else {alert('failed' + this.getStatus());}}, {enableHighAccuracy: true})map.addEventListener("click", showInfo);//清除标识 function clearOverlays() {if (markersArray) {for (i in markersArray) {map.removeOverlay(markersArray[i])}}}//地图上标注 function addMarker(point) {var marker = new BMap.Marker(point);markersArray.push(marker);clearOverlays();map.addOverlay(marker);}//点击地图时间处理 function showInfo(e) {document.getElementById('lng').value = e.point.lng;document.getElementById('lat').value = e.point.lat;geoc.getLocation(e.point, function(rs) {var addComp = rs.addressComponents;var address = addComp.province + addComp.city + addComp.district + addComp.street + addComp.streetNumber;document.getElementById('sever_add').value = address;});addMarker(e.point);}</script></html>
可参考更详细指南：知乎-爬虫与数据分析
