<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>无标题文档</title>
<script>
window.onload = function() {
var oForm = document.getElementById(‘form1‘);
var oBtn = document.getElementById(‘btn‘);
//onchange : 当值发生改变的时候触发
//text : 当光标离开元素的时候再去判断值是否发生了变化,如果发生了变化则触发onchange事件
/*oForm.username.onchange = function() {
alert(‘值变了‘);
}*/
/*oForm.sex[0].onchange = function() {
alert(1);
}*/
for (var i=0; i<oForm.aihao.length; i++) {
oForm.aihao[i].onchange = function() {
//alert(1);
if (this.checked) {
alert(‘你选择了:‘ + this.value);
} else {
alert(‘你取消了:‘ + this.value);
}
}
}
oForm.city.onchange = function() {
alert(this.value);
}
}
</script>
</head>
<body>
<form id="form1">
<input type="text" name="username" />
<input type="radio" name="sex" value="男" />男
<input type="radio" name="sex" value="女" checked />女
<input type="checkbox" name="aihao" value="电影" />电影
<input type="checkbox" name="aihao" value="音乐" />音乐
<input type="checkbox" name="aihao" value="体育" />体育
<select name="city" value="">
<option>请选择一个城市</option>
<option value="北京">北京</option>
<option value="上海" selected>上海</option>
<option value="广州">广州</option>
<option value="深圳">深圳</option>
</select>
<input type="button" value="按钮" id="btn" />
<input type="submit" value="提交" />
</form>
</body>
</html>