对Google Maps API的JS文件解析(map.js)

最新推荐文章于 2024-08-30 09:24:17 发布

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最新推荐文章于 2024-08-30 09:24:17 发布

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文章标签： javascript ViewUI

作者下载了Google Maps API所调用的JS文件的源文件，对其进行研究并添加了注释。

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我下载了Google Maps API所调用的JS文件的源文件，研究了一下，做了一点注释，现在放在下面

var _mSiteName = 'Google Maps';
2

var _mZoomIn = 'Zoom In';
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var _mZoomOut = 'Zoom Out';
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var _mZoomSet = 'Click to set zoom level';
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var _mZoomDrag = 'Drag to zoom';
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var _mPanWest = 'Go left';
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var _mPanEast = 'Go right';
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var _mPanNorth = 'Go up';
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var _mPanSouth = 'Go down';
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var _mLastResult = 'Return to the last result';
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var _mGoogleCopy = '?2005 Google';
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var _mDataCopy = 'Map data ?2005 ';
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var _mNavteq = 'NAVTEQ?';
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var _mTeleAtlas = 'Tele Atlas';
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var _mZenrin = 'ZENRIN';
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var _mZenrinCopy = 'Map ?2005 ';
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var _mNormalMap = 'Map';
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var _mNormalMapShort = 'Map';
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var _mHybridMap = 'Hybrid';
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var _mHybridMapShort = 'Hyb';
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var _mNew = 'New!';
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var _mTerms = 'Terms of Use';
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var _mKeyholeMap = 'Satellite';
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var _mKeyholeMapShort = 'Sat';
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var _mKeyholeCopy = 'Imagery ?2005 ';
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var _mScale = 'Scale at the center of the map';
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var _mKilometers = 'km';
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var _mMiles = 'mi';
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var _mMeters = 'm';
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var _mFeet = 'ft';
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var _mDecimalPoint = '.';
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var _mThousandsSeparator = ',';
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var _mMapErrorTile = 'We are sorry, but we don\'t have maps at this zoom level for this region.Try zooming out for a broader look.';
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var _mKeyholeErrorTile = 'We are sorry, but we don\'t have imagery at this zoom level for this region.Try zooming out for a broader look.';
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var _mTermsURL = 'http://www.google.com/help/terms_local.html';
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var _apiHash = '5f87579ff86792cf982d095a4228e3de6cdaf562';
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var _apiKey = 'ABQIAAAA7nPTPXCvzWYxyKdmbFQfTxRfh1ef-GeSz5gtCVpCKOPebNr1YhR23M_jRfeqAugNMsW3pZQJAwfCFw';
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var _mApiBadKey = 'The Google Maps API key used on this web site was registered for a different web site. You can generate a new key for this web site at http://www.google.com/apis/maps/.';
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function createMapSpecs()
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{
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var mt = '';
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var tv = 'w2.5';
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var apitv = 'w2.5';
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var hmt = '';
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var htv = 'w2t.1';
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var apihtv = 'w2t.1';
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var kmt = '';
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var kdomain = 'google.com';
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var ktv = '3';
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var kdisable = false;
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var khauth = 'fzwq2uohc9nRek9eHfZgC_oFXnYU9GSk3iYwgw';
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var kjapandatumhack = true;
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var hybrid = (htv != '');
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if (!arguments.callee.mapSpecs)
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{
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var mapSpecs = [];
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var tileVersion = window._apiKey ? apitv : tv;
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var hTileVersion = window._apiKey ? apihtv : htv;
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var mapCopy = (tileVersion != tv) ? G_MAP_API_COPYRIGHTS :G_MAP_DEFAULT_COPYRIGHTS;
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var hybridCopy = (hTileVersion != htv) ? G_MAP_API_COPYRIGHTS :G_MAP_DEFAULT_COPYRIGHTS;
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_GOOGLE_MAP_TYPE = new _GoogleMapMercSpec(mt, tileVersion, mapCopy);
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mapSpecs.push(_GOOGLE_MAP_TYPE);
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if (!kdisable)
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{
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_SATELLITE_TYPE = new _KeyholeMapMercSpec(kmt, kdomain, ktv, khauth,kjapandatumhack);
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mapSpecs.push(_SATELLITE_TYPE);
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if (hybrid)
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{
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_HYBRID_TYPE = new _HybridMapSpec(kmt, kdomain, ktv, khauth,kjapandatumhack, hmt, hTileVersion,hybridCopy);
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mapSpecs.push(_HYBRID_TYPE);
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}
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_KATRINA_TYPE = new _KatrinaMapSpec(kmt, kdomain, ktv, khauth);
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mapSpecs.push(_KATRINA_TYPE);
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}
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arguments.callee.mapSpecs = mapSpecs;
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}
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return arguments.callee.mapSpecs;
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}
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//取得浏览器名称字符串
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var _u = navigator.userAgent.toLowerCase();
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//检查是否存在t子字符串
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function _ua(t)
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{
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return _u.indexOf(t) != -1;
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}
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//用t作前缀解析_u，取得_u后面的城市
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function _uan(t)
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{
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if(!window.RegExp)
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{
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return 0;
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}
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var r = new RegExp(t+'([0-9]*)');
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var s = r.exec(_u);
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var ret = 0;
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if (s.length >= 2)
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{
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ret = s[1];
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}
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return ret;
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}
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//是否支持ActiveX（使用Microsoft.XMLDOM）
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function _noActiveX()
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{
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if(!_ua('msie') || !document.all || _ua('opera'))
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{
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return false;
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}
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var s = false;
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eval('try

{ new ActiveXObject("Microsoft.XMLDOM"); }'+'catch (e)

{ s = true; }');
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return s;
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}
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//检查浏览器名称是否正常
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function _compat()
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{
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return ((_ua('opera') &&(_ua('opera 7.5') || _ua('opera/7.5') ||_ua('opera 8') || _ua('opera/8'))) ||(_ua('safari') && _uan('safari/') >= 125) ||(_ua('msie') &&!_ua('msie 4') && !_ua('msie 5.0') && !_ua('msie 5.1') &&!_ua('msie 3') && !_ua('powerpc')) ||(document.getElementById && window.XSLTProcessor &&window.XMLHttpRequest && !_ua('netscape6') &&!_ua('netscape/7.0')));
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}
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//这里也比较让人费解，_compat和_browserIsCompatible、GBrowserIsCompatible其实都差不多啊
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_fc = false;
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_c = _fc || _compat();
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//返回浏览器兼容性，不知道为什么会有两个一样的函数
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function _browserIsCompatible()
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{
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return _c;
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}
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function GBrowserIsCompatible()
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{
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return _c;
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}
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//判断浏览器是否存在xslt解析
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function _havexslt()
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{
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if (typeof GetObject != 'undefined' ||(typeof XMLHttpRequest != 'undefined' &&typeof DOMParser != 'undefined' &&typeof XSLTProcessor != 'undefined'))
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{
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return true;
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}
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else
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{
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return false;
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}
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}
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//载入一个JS文件
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function _script(src)
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{
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