function s(obj) {
var t = eval("document.getElementById(" + obj + ").value");
alert(t);
//alert(document.getElementById("txt").value);
}
</script>
</head>
<body>
<form name="form" id="form" action="">
<input type="text" id="txt" name="txt" />
<input type="button" value="test" onclick="s('txt');" />
</form>
去掉 form 报 ‘缺少对象’错误
不去掉form 报 ‘缺少 ’txt‘对象’
请各位解释 谢谢
var t = eval("document.getElementById('" + obj + "').value");
alert(t);
//alert(document.getElementById("txt").value);
}