javascript html小技巧
1. eval() 可以解析字符串，当作javascript语句执行。比如：eval("5-3*2")，可以制作简单的计算器。eval("alert('Hello World')")这可以执行alert语句。form.input.value = eval(form.input.value)
2. 数学函数
form.input.value = Math.cos(x);
3. Add a row for t table
<script language="javascript">function add(){var t = document.getElementById("t");var tr = t.insertRow(t.rows.length-1);tr.insertCell().innerHTML="<input name='a'>";tr.insertCell().innerHTML="<input name='b'>";tr.insertCell().innerHTML="<input name='c'>";tr.insertCell().innerHTML="<input type='button' value='del' onclick='del(this)'>";}function del(button){if(!confirm("Delete?"))return;var tr = button.parentNode.parentNode;tr.parentNode.removeChild(tr);}</script>
4. Load style file(css) according user's setting
<link rel="Stylesheet" type="text/css" href="/ui/css/default.css" runat="server" id="defaultcss" />
defaultcss.Attributes["href"] = "/css/abcd.css"
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