<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>无标题文档</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">
function checkall(){
var hobby = document.getElementsByTagName("input");
// 任务1
for(var i=0;i<hobby.length;i++){
if(hobby[i].type=="checkbox"){
hobby[i].checked=true;
}
}
}
function clearall(){
var hobby = document.getElementsByName("hobby");
// 任务2
for(var j=0;j<hobby.length;j++){
if(hobby[j].type="checkbox"){
hobby[j].checked=false;
}
}
}
function checkone(){
var j=document.getElementById("wb").value;
var inpu=document.getElementsByTagName("input");
// 任务3
for(var n=0;n<inpu.length;n++){
if(j==(n+1)){
inpu[n].checked=true;
}else{
}
}
}
</script>
</body>
</html>
<script type="text/javascript">
function checkall () {
var hobby = document.getElementsByTagName('input')
for (var i = 0; i < hobby.length; i++) {
tagsName = hobby[i]
if (tagsName.type == 'checkbox') {
tagsName.checked = true
}
}
}
function clearall () {
var hobby = document.getElementsByName('hobby')
for (var i = 0; i < hobby.length; i++) {
tagsName = hobby[i]
if (tagsName.type == 'checkbox' && tagsName.checked == true) {
tagsName.checked = false
}
}
}
function checkone () {
var j = document.getElementById('wb').value
if (0 < j <= 6) {
tagId = 'hobby' + j
var hobby = document.getElementById(tagId)
hobby.checked = true
}
}
</script><!DOCTYPE HTML>
<html>
<head>
<meta charset="utf-8">
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>无标题文档</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">
function checkall(){
var hobby = document.getElementsByTagName("input");
// 任务1
for (var i = 0; i <= hobby.length - 1; i++) {
if (hobby[i]['name'] == 'hobby') {
hobby[i].checked = true;
}
}
}
function clearall(){
var hobby = document.getElementsByName("hobby");
// 任务2
for (var i = 0; i <= hobby.length - 1; i++) {
hobby[i].checked = false;
}
}
function checkone(){
var j=document.getElementById("wb").value;
// 任务3
document.getElementById("hobby"+j).checked = true;
}
</script>
</body>
</html>