JS复制粘贴另存代码

<SCRIPT> function Preview(obj) {   var TestWin=open('');   TestWin.document.write(obj.value); } function copyCode(obj) {     var rng = document.body.createTextRange();     rng.moveToElementText(obj);     rng.scrollIntoView();     rng.select();     rng.execCommand("Copy");     rng.collapse(false); } function saveCode(obj) {     var winname = window.open('', '_blank', 'top=10000');     winname.document.open('text/html', 'replace');     winname.document.writeln(obj.value);     winname.document.execCommand('saveas','','homepage.yesky.com.htm');     winname.close(); } </SCRIPT><TEXTAREA id=code2 style="WIDTH: 400px; HEIGHT: 240px" rows=15 cols=47>1</TEXTAREA><BR><BUTTON onclick=Preview(code2)>运行代码</BUTTON><BUTTON onclick=copyCode(code2)>复制代码</BUTTON><BUTTON onclick=saveCode(code2)>另存代码</BUTTON>