How to use JavaScript to implement copy, Paste function

Copies can be used: objects. createTextRange (). ExecCommand ("copy") command, you can use:
Window.clipboardData.setData ("text", source of content)
Here the source of the content such as to get text box ID for y text copy to the Clipboard, here write Y.value

Pasting is actually the Value property of the target object =y.value

Cut is based on selection, you must first set up a selection area, such as a text box ID is a, to cut the text inside need to:
A.createtextrange (). ExecCommand ("Cut")
To complete the cut.

Select All, if you have a text box ID of B, select All only B.select ().