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console

            
function run()
	{
		var p1 = getElementValue('param1');
		var p2 = getElementValue('param2');
		var p3 = getElementValue('param3');
		var a1 = getElementValue('arg1');
		var a2 = getElementValue('arg2');
		var a3 = getElementValue('arg3');
		var body = getElementValue('func_body');

		var testFunc = new Function(p1,p2,p3,body);
		var result = testFunc(a1, a2, a3);

		setInnerHtml('func_def', testFunc.toString())
		setInnerHtml('return_value', result)

        function getElementValue(id){
			return document.getElementById(id).value;
		}

        function setInnerHtml(id, innerHtml){
			var el = document.getElementById(id);
			el.innerHTML = innerHtml;
		}
	}
	// var test = new Function();
	// console.log(test.name);

            
<!DOCTYPE html>
<html>
<head>
	<meta charset="utf-8">
	<title>test</title>
</head>
<body>
	<table>
		<tr>
			<td>形参</td>
			<td>
				<input type="text" id="param1">
				<input type="text" id="param2">
				<input type="text" id="param3">
			</td>
		</tr>
		<tr>
			<td>实参</td>
			<td>
				<input type="text" id="arg1">
				<input type="text" id="arg2">
				<input type="text" id="arg3">
			</td>
		</tr>
		<tr>
			<td>函数体</td>
			<td>
				<textarea type="text" id="func_body"></textarea>
			</td>
		</tr>
		<tr>
			<td>测试函数</td>
			<td>
				<span id="func_def"></span>
			</td>
		</tr>
		<tr>
			<td>返回值</td>
			<td>
				<b><span id="return_value"></span></b>
			</td>
		</tr>
	</table>
	<button onclick="run()">运行</button>
</body>
</html>