一起学习 欢迎提问
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
<script type="text/javascript">
//直接id
function testid(){
var username=window.document.getElementById("username");
console.log(username);}
testid()
//标签 tag
function testTag(){
var istag=document.getElementsByTagName("input");
console.log(istag)
//name 获得
} var isclass(){
var isclass=document.getElementsByName("hobby")
console.log(isclass)
}
</script>
</head>
<body>
<form action="" id="form1">
用户名 <input type="text" name="username" id="username" value="请输入姓名" ><br />
密码： <input type="password" name="pwd" id="pwd" value="333"/><br />
爱好： <input type="checkbox" name="hobby" value="music" />音乐
<input type="checkbox" name="hobby" value="sports" />体育
<input type="checkbox" name="hobby" value="art"/>美术<br />
职业： <select name="professional" id="professional">
<option value="1">工人</option>
<option value="2" id="p2">农民</option>
<option value="3">解放军</option>
<option value="4">知识分子</option>
</select><br />
<input type="button" value="提交" calss="ww"/>
</form>
</body>
</html>
