<img src='' /> 当Img 标签有空的src属性时

当Img 标签有空的src属性时（即<img src='' />）时，Chrome Version : 4.0.249.89 (38071)

URLs (if applicable) :
Other browsers tested:
Add OK or FAIL after other browsers where you have tested this issue:
     Safari 4: FAIL
  Firefox 3.x: FAIL (3.5 fixed <img> only)
         IE 7: FAIL (<script>, <link> don't cause requests, <img> does)
         IE 8: FAIL (<script>, <link> don't cause requests, <img> does)
     Opera 10: OK

What steps will reproduce the problem?
1. Place <img src="">, or <script src="">, or <link rel="stylesheet"
href=""> into a page.
2. Load the page in Chromium while monitoring HTTP traffic.


What is the expected result?

There should be only one request to the page.

可能会建立新链接或使

http://stackoverflow.com/questions/3483402/aware-of-img-tags-with-empty-src-in-chrome

io多打开几次；

https://code.google.com/p/chromium/issues/detail?id=38144

综上：

src最好赋值为（//:0和javascript:void（0））

refer||[http://stackoverflow.com/questions/5775469/whats-the-valid-way-to-include-an-image-with-no-src]

 

备注:void 0 ===undefined（会执行表达式getValue(),但返回值是undefined！）