用javascript 复制文本框中的内容到剪切板

< script language = " javascript " >   
function  setImg(no) 
... { 
var t=document.getElementById(no); 
t.select(); 
window.clipboardData.setData('text',t.createTextRange().text); 
alert("复制成功！");
}  
</ script >


< td width = " 387 " >
       < input id = " js "  name = " img_url "  type = " text "  class = " s1 "  size = " 80 "  value = " javascript复制文本框 " />      </ td >
     < td width = " 277 " >< label >
       < input type = " submit "  name = " Submit "  value = " 复制地址 "  onclick = " js " />
     </ label ></ td >