问题
In my search for a Javascript way to programmatically select WebView content, I encountered this Javascript code snippet, which uses a method named setData() in a member named clipboardData in the window object.
But when I tried to find documentation for it in a Javascript reference, clipboardData was nowhere to be found.
Why?
Isn't window.clipboardData not part of Javascript or DOM?
回答1:
No, it's not part of any standard. Except for IE, most browsers don't allow clipboard access because of security concerns (you don't want arbitrary webpages reading something sensitive information that you put into your clipboard).
回答2:
I believe only IE lets you access the clipboard. Older versions of other browsers used to, but this has been switched off by default as a security measure. Users can explicitly turn it on via settings/options/preferences, but this is obviously not ideal in most situations.
The workaround is to use a flash object on the page. Since Flash 10 added more security layers, user interaction is also required now with the flash object (e.g. a click rather than say onload event).
I found and implemented the good work from the well written article at the bottom of my answer. He explains the issue in more detail, with links to official statements from Adobe/Mozilla and supplies a usable and a downloadable example, and the source code to the fla. This is handy if you want to reskin/redesign his button.
I have tested successfully on Windows7 using latest (as at 7/7/2011) Chrome/Safari/RockMelt/FF/IE7/IE8/IE9 and MacOSX(SL) Safari/FF.
The only downside is that it uses flash which is mostly fine except for some mobile platforms and a small portion of (ab)normal users. Also I found you need to access over http (a web server), opening and using the demo page via the file system (i.e. double clicking the html file in Explorer) won't work.
Thanks for sharing Rahul, awesome job.
http://www.rahulsingla.com/blog/2010/03/cross-browser-approach-to-copy-content-to-clipboard-with-javascript
来源：https://stackoverflow.com/questions/5278408/window-clipboarddata-is-not-part-of-javascript