代码如下：
<SCRIPT> function runEx(){ var winEx2 = window.open("", "winEx2", "width=500,height=300,status=yes,menubar=no,scrollbars=yes,resizable=yes"); winEx2.document.open("text/html", "replace"); winEx2.document.write(unescape(event.srcElement.parentElement.children[0].value)); winEx2.document.close(); } function saveFile() { var win=window.open('','','top=10000,left=10000'); win.document.write(document.all.asdf.innerText) win.document.execCommand('SaveAs','','javascript.htm') win.close(); } </SCRIPT> <TEXTAREA id=asdf name=textfield rows=13 wrap=VIRTUAL cols="46"><font color=red>测试:特效预览框</font>