题解 | #全选#
全选
https://www.nowcoder.com/practice/84b89f326e3c4e96bacb63296e84623a
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
</head>
<style>
ul {
list-style: none;
}
</style>
<body>
<ul>
<li>全选<input type='checkbox' id='all'></li>
<li>Java<input type='checkbox' class='item'></li>
<li>javaScript<input type='checkbox' class='item'></li>
<li>C++<input type='checkbox' class='item'></li>
<li>python<input type='checkbox' class='item'></li>
<li>.net<input type='checkbox' class='item'></li>
</ul>
<script>
// 补全代码
var all = document.querySelector('#all');
var options = Array.from(document.querySelectorAll('.item'));
all.onchange = () => {
options.forEach(i => i.checked = all.checked)
}
options.forEach( item =>{
item.onchange = function() {
all.checked = options.every(x => x.checked)
}
})
</script>
</body>
</html>
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