取得目前可見視窗內容的尺寸--Javascript[含1張圖]

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最近用javascript取視窗的大小時，遇到不同瀏覽器無法偵測或不同的寬高的問題。後來找到下段這段程式碼，當用於點圖放大並顯示於前景中央位置時非常有用。

1. <script type="text/javascript">
   
2. <!--
   
3. 
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4. var viewportwidth;
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5. var viewportheight;
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6. 
   
7. // the more standards compliant browsers (mozilla/netscape/opera/IE7) use window.innerWidth and window.innerHeight
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8. 
   
9. if (typeof window.innerWidth != 'undefined')
   
10. {
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11.       viewportwidth = window.innerWidth,
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12.       viewportheight = window.innerHeight
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13. }
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14. 
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15. // IE6 in standards compliant mode (i.e. with a valid doctype as the first line in the document)
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16. 
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17. else if (typeof document.documentElement != 'undefined'
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18.      && typeof document.documentElement.clientWidth !=
    
19.      'undefined' && document.documentElement.clientWidth != 0)
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20. {
    
21.        viewportwidth = document.documentElement.clientWidth,
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22.        viewportheight = document.documentElement.clientHeight
    
23. }
    
24. 
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25. // older versions of IE
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26. 
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27. else
    
28. {
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29.        viewportwidth = document.getElementsByTagName('body')[0].clientWidth,
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30.        viewportheight = document.getElementsByTagName('body')[0].clientHeight
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31. }
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32. document.write('<p>Your viewport width is '+viewportwidth+'x'+viewportheight+'</p>');
    
33. //-->
    
34. </script>

複製代碼

結果: 在google chrome 顯示結果


來源: Get viewport size (width and height) with javascript
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