reference:
http://webomnizz.com/how-to-make-responsive-google-map-with-google-map-api/
方法一：css
HTML內容:
<div class="map-canvas" id="map-canvas">
<iframe frameborder="0" height="350" marginheight="0" marginwidth="0" scrolling="no" src="https://www.google.com.tw/maps/@24.7655142,121.0162967,15z?hl=zh-TW" width="425"></iframe>
</div>
