js实现复制功能(多种方法集合)

用户定义的代码区域

function copyToClipboard(txt) {
      if (window.clipboardData) {
        window.clipboardData.clearData();
        clipboardData.setData("Text", txt);
        alert("复制成功！");

      } else if (navigator.userAgent.indexOf("Opera") != -1) {
        window.location = txt;
      } else if (window.netscape) {
        try {
          netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");
        } catch (e) {
          alert("被浏览器拒绝！\n请在浏览器地址栏输入'about:config'并回车\n然后将 'signed.applets.codebase_principal_support'设置为'true'");
        }
        var clip = Components.classes['@mozilla.org/widget/clipboard;1'].createInstance(Components.interfaces.nsIClipboard);
        if (!clip)
          return;
        var trans = Components.classes['@mozilla.org/widget/transferable;1'].createInstance(Components.interfaces.nsITransferable);
        if (!trans)
          return;
        trans.addDataFlavor("text/unicode");
        var str = new Object();
        var len = new Object();
        var str = Components.classes["@mozilla.org/supports-string;1"].createInstance(Components.interfaces.nsISupportsString);
        var copytext = txt;
        str.data = copytext;
        trans.setTransferData("text/unicode", str, copytext.length * 2);
        var clipid = Components.interfaces.nsIClipboard;
        if (!clip)
          return false;
        clip.setData(trans, null, clipid.kGlobalClipboard);
        alert("复制成功！");
      }
    }

 

  

   
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function copyToClipboard(txt) {  
	if(window.clipboardData){  
		window.clipboardData.clearData();  
		window.clipboardData.setData("Text", txt);
		alert('复制成功！')
	}else{
		alert('请手动复制！')	
	}  
}