一个js的简单实验
思路：通过 document.getElementsByTagName(‘input‘)获取集合，判断类型是否为checkbox，再对其进行操作
<!DOCTYPE html><html><head lang="en"> ???<meta charset="UTF-8"> ???<title></title></head><body> ???<form> ???????<input type="checkbox" name="fruit" value="苹果">苹果 ???????<input type="checkbox" name="fruit" value="香蕉">香蕉 ???????<input type="checkbox" name="fruit" value="芒果">芒果 ???????<input type="checkbox" name="fruit" value="葡萄">葡萄 ???</form> ???<button id="all">全选</button> ???<button id="not">全不选</button> ???<button id="reve">反选</button> ???<script> ???????var all = document.getElementById(‘all‘); ???????var not = document.getElementById(‘not‘); ???????var reve = document.getElementById(‘reve‘); ???????var fruit = document.getElementsByTagName(‘input‘); ???????//全选 ???????all.onclick = function(){ ???????????for(var i=0;i<=fruit.length;i++){ ???????????????if(fruit[i].type == ‘checkbox‘){ ???????????????????fruit[i].checked = true; ???????????????} ???????????} ???????}; ???????//全不选 ???????not.onclick = function(){ ???????????for(var i=0;i<=fruit.length;i++){ ???????????????if(fruit[i].type == ‘checkbox‘){ ???????????????????fruit[i].checked = false; ???????????????} ???????????} ???????}; ???????//反选 ???????reve.onclick = function(){ ???????????for(var i=0;i<=fruit.length;i++){ ???????????????if(fruit[i].type == ‘checkbox‘){ ???????????????????/*if(fruit[i].checked == true){ ???????????????????????fruit[i].checked = false; ???????????????????}else{ ???????????????????????fruit[i].checked = true; ???????????????????}*/ ???????????????????fruit[i].checked = !fruit[i].checked; ???????????????} ???????????} ???????}; ???</script></body></html>js实现全选、全不选、反选
原文地址：https://www.cnblogs.com/whs5280/p/9750739.html