1.
function doCopy() {
   textRange = test.createTextRange();
   textRange.execCommand("Copy");
}
function doPaste() {
   textRange = taCode.createTextRange();
   textRange.execCommand("Paste");
} 

2.
 <script language="javascript">
function readTxt()
{
    alert(window.clipboardData.getData("text"));
}
function setTxt()
{
    var t=document.getElementById("txt");
    t.select();
    window.clipboardData.setData('text',t.createTextRange().text);
}
</script>
<input name="txt" value="输入测试">
<input type="button" value="复制" onclick="setTxt()">
<input type="button" value="读取" onclick="readTxt()">
window.clipboardData.clearData(); 

即可破解右键限制：javascript:void(document.body.oncontextmenu='',document.oncontextmenu='');