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一直都需要的复制到系统剪贴板之IE,firefox兼容版

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> 
<img src="/_New/_cj/myeditor/sysimage/space.gif" class="ewebeditor__script" _ewebeditor_fake_tag="script" _ewebeditor_fake_value="%3Cscript%20type%3D%22text%2Fjavascript%22%3E%20%0D%0A%2F%2F%20%3C!%5BCDATA%5B%20%0D%0Afunction%20copy_clip(copy)%7B%20%0D%0Aif%20(window.clipboardData)%7B%20%0D%0Awindow.clipboardData.setData(%22Text%22%2C%20copy)%3B%7D%20%0D%0Aelse%20if%20(window.netscape)%7B%20%0D%0Anetscape.security.PrivilegeManager.enablePrivilege('UniversalXPConnect')%3B%20%0D%0Avar%20clip%20%3D%20Components.classes%5B'%40mozilla.org%2Fwidget%2Fclipboard%3B1'%5D.createInstance(Components.interfaces.nsIClipboard)%3B%20%0D%0Aif%20(!clip)%20return%3B%20%0D%0Avar%20trans%20%3D%20Components.classes%5B'%40mozilla.org%2Fwidget%2Ftransferable%3B1'%5D.createInstance(Components.interfaces.nsITransferable)%3B%20%0D%0Aif%20(!trans)%20return%3B%20%0D%0Atrans.addDataFlavor('text%2Funicode')%3B%20%0D%0Avar%20str%20%3D%20new%20Object()%3B%20%0D%0Avar%20len%20%3D%20new%20Object()%3B%20%0D%0Avar%20str%20%3D%20Components.classes%5B%22%40mozilla.org%2Fsupports-string%3B1%22%5D.createInstance(Components.interfaces.nsISupportsString)%3B%20%0D%0Avar%20copytext%3Dcopy%3B%20%0D%0Astr.data%3Dcopytext%3B%20%0D%0Atrans.setTransferData(%22text%2Funicode%22%2Cstr%2Ccopytext.length*2)%3B%20%0D%0Avar%20clipid%3DComponents.interfaces.nsIClipboard%3B%20%0D%0Aif%20(!clip)%20return%20false%3B%20%0D%0Aclip.setData(trans%2Cnull%2Cclipid.kGlobalClipboard)%3B%7D%20%0D%0Aalert(%22%E5%B7%B2%E5%A4%8D%E5%88%B6%22%2Bcopy)%20%0D%0Areturn%20false%3B%20%0D%0A%7D%20%0D%0A%2F%2F%20%5D%5D%3E%20%0D%0A%3C%2Fscript%3E"> 
<h1>请另存代码测试</h1> 
<input type="text" id="ff" value="www.blueidea.com" /><button onclick="copy_clip(document.getElementById('ff').value)">复制 
</button>

　　 [Ctrl+A 全选注:如需引入外部Js需刷新才能执行]

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