{"json_modified": "2016-08-30T18:18:41.365274", "uuid": "ce2d1900-3abc-4256-8013-feeecfbead2e", "title": "Coordinates.heading", "url": "/en-US/docs/Web/API/Coordinates/heading", "tags": ["Coordinates", "Property", "API", "Geolocation API"], "translations": [{"uuid": "92ece4bb-99ba-4c06-be18-62795184b012", "title": "Coordinates.heading", "url": "/zh-TW/docs/Web/API/Coordinates/heading", "tags": [], "summary": "<code><strong>Coordinates.heading</strong></code> \u662f\u500b\u552f\u8b80\u7684\u6b63\u8907\u6578\u7528\u4f86\u4ee3\u8868\u88dd\u7f6e\u524d\u9032\u7684\u65b9\u5411\u3002\u9019\u500b\u6578\u503c\u4ee3\u8868\u4f60\u504f\u96e2\u5317\u65b9\u591a\u5c11\u5ea6\uff0c0\u5ea6\u4ee3\u8868\u4f60\u5411\u8457\u6b63\u5317\u65b9\uff0c\u7167\u8457\u9806\u6642\u91dd\u7684\u65b9\u5411\u905e\u589e(90\u5ea6\u4ee3\u8868\u6b63\u6771\u65b9\uff0c270\u5ea6\u4ee3\u8868\u6b63\u897f\u65b9)\u3002\u5982\u679c<a href=\"/zh-TW/docs/Web/API/Coordinates/speed\" title=\"The documentation about this has not yet been written; please consider contributing!\"><code>Coordinates.speed</code></a> \u70ba0\u5ea6\uff0c\u5247\u6b64\u503c\u70ba <code><a href=\"https://developer.mozilla.org/en-US/docs/JavaScript/Reference/Global_Objects/NaN\" title=\"/en-US/docs/JavaScript/Reference/Global_Objects/NaN\">NaN</a></code>\u3002\u5982\u679c\u9019\u500b\u88dd\u7f6e\u7121\u6cd5\u63d0\u4f9b\u9019\u500b\u503c\u5247\u56de\u50b3 null\u3002", "localization_tags": [], "locale": "zh-TW", "last_edit": "2016-03-22T23:45:57", "review_tags": []}], "modified": "2016-08-30T18:18:41", "label": "Coordinates.heading", "localization_tags": [], "locale": "en-US", "id": 81051, "last_edit": "2016-08-30T18:18:36", "summary": "The <code><strong>Coordinates.heading</strong></code> read-only property is a <code>double</code> representing the direction in which the device is traveling. This value, specified in degrees, indicates how far off from heading due north the device is. <font face=\"Consolas, Liberation Mono, Courier, monospace\">Zero</font>\u00a0degrees represents true true north, and the direction is determined clockwise (which means that east is <code>90</code> degrees and west is <code>270</code> degrees). If <a href=\"/en-US/docs/Web/API/Coordinates/speed\" title=\"The Coordinates.speed read-only property is a double representing the velocity of the device in meters per second. This value is null if the implementation is not able to measure it.\"><code>Coordinates.speed</code></a> is <code>0</code>, <code>heading</code> is <code><a href=\"https://developer.mozilla.org/en-US/docs/JavaScript/Reference/Global_Objects/NaN\">NaN</a></code>. If the device is not able to provide heading information, this value is <code>null</code>.", "sections": [{"id": "Quick_Links", "title": null}, {"id": "Syntax", "title": "Syntax"}, {"id": "Specifications", "title": "Specifications"}, {"id": "Browser_compatibility", "title": "Browser compatibility"}, {"id": "See_also", "title": "See also"}], "slug": "Web/API/Coordinates/heading", "review_tags": []}