html：
<div><div><a href="#">全选</a><a href="#">反选</a><a href="#">取消</a></div><label><input type="checkbox" value="苹果" name="box">苹果</label><br><label><input type="checkbox" value="草莓" name="box">草莓</label><br><label><input type="checkbox" value="橙子" name="box">橙子</label><br><label><input type="checkbox" value="苹果" name="box">苹果</label><br><label><input type="checkbox" value="西瓜" name="box">西瓜</label></div>script：
<script>var inputs = document.querySelectorAll("input")// 全选document.querySelectorAll("a")[0].onclick = function () {for (let i = 0; i < inputs.length; i++) {inputs[i].checked = true}}// 反选document.querySelectorAll("a")[1].onclick = function () {for (let i = 0; i < inputs.length; i++) {if (inputs[i].checked == true) {inputs[i].checked = false} else {inputs[i].checked = true}}}// 取消document.querySelectorAll("a")[2].onclick = function () {for (let i = 0; i < inputs.length; i++) {inputs[i].checked = false}}</script>
