Javascript功能代码收集(不断更新中...)

1.很多的网站都有一个html执行功能,其实实现起来非常简单:

<script language="javascript" type="text/javascript">
        function runCode()
        {
            var code=document.getElementById("testarea").value;
            if(code=="")
            {
                window.alert("代码框不能为空");
                return;
            }
            else
            {
                var newin=window.open('','','');
                newin.opener=null;
                newin.document.write(code);
                newin.document.close();
            }
        }
</script>
<textarea id="testarea" rows="5" cols="60"/>
<input type="button" value="确定" onclick="runCode();" />

2.在IE上实现复制到剪贴板的功能(只适应于IE)

<script language="javascript" type="text/javascript">
        function runCode()
        {
            if(document.all)
            {
                otextRange=document.getElementById("testarea").createTextRange();
                otextRange.execCommand("Copy");
                window.alert("数据已复制到剪贴板");
            }
        }
</script>
<textarea id="testarea" rows="5" cols="60"></textarea>
<input type="button" value="确定" onclick="runCode();" />

3.Javascript函数execCommand详解
详见:http://www.blueidea.com/tech/web/2003/1242.asp,如:
winname.document.execCommand('saveas','','Code.htm'); ----保存代码
4.javascript更改元素的透明度:document.getElementById("eleName").filters.alpha.opacity=40;