js简易全选和反选

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于 2020-07-19 21:20:05 发布

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文章标签： javascript

本文链接：https://blog.youkuaiyun.com/Ga_b_c/article/details/107451678

全选：<input type="checkbox" id="checkAll"> <br>
    选项：<input type="checkbox" class="checkOne">A
    <input type="checkbox" class="checkOne">B
    <input type="checkbox" class="checkOne">C 
    <input type="checkbox" class="checkOne">D

    <script>
        var chkAll = document.querySelector('#checkAll');
        var chkOne = document.querySelectorAll('.checkOne');
        console.log(chkAll,chkOne);
        chkAll.onclick = function(){
            for(var i = 0 ; i < chkOne.length ; i++){
                chkOne[i].checked = this.checked
            }
        }
        
        for(var i = 0 ; i < chkOne.length ; i++){
            chkOne[i].onclick = function(){
               

                for(var j = 0 ; j < chkOne.length ;j++){
                    if(!chkOne[j].checked){
                        break
                    }
                }
                chkAll.checked = (j == chkOne.length);
            }
            
        }        
    </script>