自己做的本章测试（复选框）
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>复选框事件</title>
</head>
<body>
<form>
请选择你爱好:<br>
<input type="checkbox" name="hobby" id="hobby1"> 音乐
<input type="checkbox" name="hobby" id="hobby2"> 登山
<input type="checkbox" name="hobby" id="hobby3"> 游泳
<input type="checkbox" name="hobby" id="hobby4"> 阅读
<input type="checkbox" name="hobby" id="hobby5"> 打球
<input type="checkbox" name="hobby" id="hobby6"> 跑步 <br>
<input type="button" value="全选" onclick="checkall();">
<input type="button" value="全不选" onclick="clearall();">
<p>请输入您要选择爱好的序号，序号为1-6:</p>
<input id="wb" name="wb" type="text">
<input name="ok" type="button" value="确定" onclick="checkone();">
</form>
<script type="text/javascript">
//实现复选框的全选功能
function checkall() {
var chec = document.getElementsByName("hobby")
for (var i = 0; i < chec.length; i++) {
chec[i].checked = "true";
}
}
//实现复选框的全不选功能
function clearall() {
var chec = document.getElementsByName("hobby");
for (var j = 0; j < chec.length; j++) {
chec[j].checked = event.srcElement.checked;
}
}
function checkone() {
var j = document.getElementById("wb").value;
var num = parseInt(j);
switch (num) {
case 1:
document.getElementById("hobby1").checked = "true";
break;
case 2:
document.getElementById("hobby2").checked = "true";
break;
case 3:
document.getElementById("hobby3").checked = "true";
break;
case 4:
document.getElementById("hobby4").checked = "true";
break;
case 5:
document.getElementById("hobby5").checked = "true";
break;
case 6:
document.getElementById("hobby6").checked = "true";
break;
default:
alert("输入错误，请重新输入...");
}
}
</script>
</body>
</html>
