這久在修改一個項目的小東西，要求把下拉框改為單選框，由于代碼封閉，修改不了擷取函數，是以想了個辦法讓下拉框的内容随單選框的内容變化，下面把代碼分享給大家：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>PHP下拉框對單選框變化</title>
<script type="text/javascript">
var m = "5";
document.getElementById("test").value= m;
</script>
</head>
<body>
<input type="text" name="test" id="test">
<select name="sel" id="sel" onchange="look();">
<option value="1" >11</option>
<option value="2" selected>22</option>
<option value="3">33</option>
</select>
<INPUT TYPE="radio" NAME="a" value="1" onclick="check();">aaaaaaaaaa<br>
<INPUT TYPE="radio" NAME="a" value="2" onclick="check();">bbbbbbbbb<br>
<INPUT TYPE="radio" NAME="a" value="3" onclick="check();">cccc<br>
<script LANGUAGE="javascript">
<!--
function check()
{
var sel = 0;
for (var i = 0; i < document.getElementsByName("a").length; i++)
{
if(document.getElementsByName("a")[i].checked)
{
sel = document.getElementsByName("a")[i].value;
}
}
var m = sel;
for(var i = 0;i<document.getElementById("sel").length;i++)
{
with(document.getElementById("sel").options[i])
{
if(value == m)
{
selected = true;
}
}
}
alert(sel);
}
//-->
</script>
<script type="text/javascript">
</script>
</body>
</html> 轉載于:https://www.cnblogs.com/linuxnewbie/p/4766188.html
![javascript的for (var i in data)慎用javascript中的for (var i in data)謹慎用[圖]](data:image/gif;base64,R0lGODlhAQABAIAAAP///wAAACwAAAAAAQABAAACAkQBADs=)