JS Copy button under IE solution

The source code is as follows:

<input class= "width200" maxlength= "+" type= "text" id= "Strnum" name= "Strnum" value= "This is what you want to copy"/><input class= "Btn_blue" type= "button"  value= "click Copy" onclick= "Javascript:window.clipboardData.setData (' text ', document.getElementById (' Strnum '). value); alert (' Replication succeeded ') "/>

A form, a button. When you finish clicking the button, the contents of the form are copied.

It is important to note that this method of replication is useful under IE8 (other versions have not been tested) and is not valid under Firefox.