PHP利用天候API获取天气信息

function Ajax(recvType) {
  var aj = new Object();
  aj.recvType = recvType ? recvType.toUpperCase() : 'HTML'//HTML XML
  aj.targetUrl = '';
  aj.sendString = '';
  aj.resultHandle = null;

  aj.createXMLHttpRequest = function() {
    var request = false;
    //window对象中有XMLHttpRequest存在就是非IE，包括（IE7，IE8）
    if (window.XMLHttpRequest) {
      request = new XMLHttpRequest();
      if (request.overrideMimeType) {
        request.overrideMimeType("text/xml");
      }
      //window对象中有ActiveXObject属性存在就是IE
    } else if (window.ActiveXObject) {
      var versions = ['Microsoft.XMLHTTP', 'MSXML.XMLHTTP', 'Msxml2.XMLHTTP.7.0', 'Msxml2.XMLHTTP.6.0', 'Msxml2.XMLHTTP.5.0', 'Msxml2.XMLHTTP.4.0', 'MSXML2.XMLHTTP.3.0', 'MSXML2.XMLHTTP'];
      for (var i = 0; i 
?网页部分代码：
<div class="iteye-blog-content-contain" style="font-size: 14px;">
<pre name="code" class="html">

  
    <meta http-equiv="content-type" content="text/html; charset=utf-8">
    <script src="http://libs.baidu.com/jquery/1.9.0/jquery.js"></script>
    <script src="http://libs.baidu.com/bootstrap/2.0.4/js/bootstrap.min.js"></script>
    <link href="http://libs.baidu.com/bootstrap/2.0.4/css/bootstrap.min.css" rel="stylesheet">
    <title>实时气温信息</title>
    <script type="text/javascript" src="./ajax.js"></script>
    <script type="text/javascript">
      function str2Array(data) {
        data = data.replace(/\|/g, "\":\"");
        data = data.replace(/,/g, "\",\"");
        data = '({\"' + data + '\"})';
        return eval(data);
      }

      function getProvince() {
        var ajax = Ajax();
        ajax.get("getstr.php?url=http://m.weather.com.cn/data5/city.xml", function(data) {
          var arr = str2Array(data);
          var prov = document.getElementById("province");
          for (var p in arr) {
            prov.options.add(new Option(arr[p], p));
          }
          prov.options.selectedIndex = 0;
          getCity(prov.value);
        });
      }

      function getCity(provId) {
        var ajax = Ajax();
        ajax.get("getstr.php?url=http://m.weather.com.cn/data5/city" + provId + ".xml", function(data) {
          var arr = str2Array(data);
          var city = document.getElementById("city");
          for (var i = city.options.length; i >= 0; i--) {
            city.remove(i);
          }
          for (var p in arr) {
            city.options.add(new Option(arr[p], p));
          }
          getTown(city.value);
        });
      }

      function getTown(provId) {
        var ajax = Ajax();
        ajax.get("getstr.php?url=http://m.weather.com.cn/data5/city" + provId + ".xml", function(data) {
          var arr = str2Array(data);
          var town = document.getElementById("town");
          for (var i = town.options.length; i >= 0; i--) {
            town.remove(i);
          }
          for (var p in arr) {
            town.options.add(new Option(arr[p], p));
          }
          getCityId();
        });
      }

      function getCityId() {
        var ajax = Ajax();
        var index = document.getElementById("town").value;
        ajax.get("getstr.php?url=http://m.weather.com.cn/data5/city" + index + ".xml", function(data) {
          var arr = str2Array(data);
          cityId = arr[index];
          showWeather(cityId);
        });
      }

      function insertTab(tab, cel1, cel2) {
        var newRow = tab.insertRow(tab.rows.length);
        var cell = newRow.insertCell(0);
        cell.innerHTML = cel1;
        var cell = newRow.insertCell(1);
        cell.innerHTML = cel2;
      }

      function showWeather(cityId) {
        if (cityId == null) {
          return;
        }
        var ajax = Ajax();
        ajax.get("getstr.php?url=http://www.weather.com.cn/data/sk/" + cityId + ".html", function(data) {
          data = '(' + data + ')';
          var info = eval(data)["weatherinfo"];
          var tab = document.getElementById("weather");

          var len = tab.rows.length;
          while(len-- > 0){
            tab.deleteRow(len);
          }

          insertTab(tab, "城市：", info["city"]);
          insertTab(tab, "城市ID：", info["cityid"]);
          insertTab(tab, "气温：", info["temp"] + "℃");
          insertTab(tab, "风向：", info["WD"]);
          insertTab(tab, "风力：", info["WS"]);
          insertTab(tab, "湿度：", info["SD"]);
          insertTab(tab, "更新时间：", info["time"]);
        });
      }

      getProvince();
    </script>
    <style type="text/css">
        select {
            width: 100px;
        }
    </style>
  
  
    <div style="margin: 20px">
      <legend>
        Weather
      </legend>
      <br>
      <select id="province" onchange="getCity(this.value)"></select>
      <select id="city" onchange="getTown(this.value)"></select>
      <select id="town" onchange="getCityId()"></select>
      <br>
      <table id="weather" class="table table-striped table-bordered" style="width: 310px"></table>
    </div>