大家一看就知道我想实现什么功能,帮我实现吧。
<head>
<script type="text/javascipt">
function selected() {
document.getElementById("2").selected="selected";
}
</script>
</head>
<body>
<select>
<option id="1">1</option>
<option id="2">2</option>
</select>
<input type="button" value="选中2" onclick="selected()">
</body>
<head>
<script type="text/javascipt">
function selected() {
document.getElementById("2").selected="selected";
}
</script>
</head>
<body>
<select>
<option id="1">1</option>
<option id="2">2</option>
</select>
<input type="button" value="选中2" onclick="selected()">
</body>
document.getElementById("select").value=value;
}<select id="select">
<option value="1">1 </option>
<option value="2">2 </option>
</select>
<input type="button" value="选中2" onclick="selected('2')">
<HTML>
<HEAD>
<TITLE> New Document </TITLE>
<META NAME="Generator" CONTENT="EditPlus">
<META NAME="Author" CONTENT="">
<META NAME="Keywords" CONTENT="">
<META NAME="Description" CONTENT="">
<script type="text/javascript">
function selected()
{
var em=document.getElementById("2");
em.selected=true;
}
</script>
</HEAD>
<BODY>
<select>
<option id="1">1 </option>
<option id="2">2 </option>
</select>
<input type="button" value="选中2" onclick="selected();">
</BODY>
</HTML>
<input type="button" value="选中2" onclick="selected();">
少了一个;号
<HTML>
<HEAD>
<script type="text/javascipt">
function selected()
{
var em=document.getElementById("2");
em.selected=true;
}
</script>
</HEAD>
<BODY>
<select>
<option id="1">1</option>
<option id="2">2</option>
</select>
<input type="button" value="选中2" onclick="selected();">
</BODY>
</HTML>
javascript,少了一个r