JavaScript之全選/反選/取消，for循環(huán)閉包

發(fā)布時(shí)間：2020-07-01 14:24:08 來源：網(wǎng)絡(luò) 閱讀：359 作者：易水寒月欄目：web開發(fā)

需求:table中要求點(diǎn)擊紅色單元格和點(diǎn)擊checkbox的效果一樣，最后一行點(diǎn)擊就是全選、反選、取消選擇的效果。
JavaScript之全選/反選/取消，for循環(huán)閉包

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        table{
            width: 400px;
            height: 15px;
            background-color: palegreen;
            text-align: center;
        }
        .check{
            width: 20%;
            background-color: indianred;
        }
        input{
            display: inline-block;
            vertical-align:middle;
        }
        div{
            display: inline-block;
            width: 400px;
        }
        div input{
            display: inline-block;
            width: 20%;
        }
        .select{
            background-color: bisque;
        }
    </style>
</head>
<body>
<table border="1" cellpadding="0" cellspacing="0">
    <tr>
        <td class="check"><input class="inputcheck" type="checkbox"></td>
        <td>富貴竹</td>
        <td>綠蘿</td>
    </tr>
    <tr>
        <td class="check"><input class="inputcheck" type="checkbox"></td>
        <td>梔子花</td>
        <td>月季</td>
    </tr>
    <tr>
        <td class="check"><input class="inputcheck" type="checkbox"></td>
        <td>金銀花</td>
        <td>菊花</td>
    </tr>
    <tr>
        <td class="check check4"><input class="inputcheck" type="checkbox"></td>
        <td>玫瑰</td>
        <td>百合</td>
    </tr>
    <tr class="select">
        <td><input class="selectall" type="button" value="全選"> </td>
        <td><input class="reserve" type="button" value="反選"> </td>
        <td><input class="cancel" type="button" value="取消"> </td>
    </tr>
</table>
<script>
    var ele= document.getElementsByTagName("input");
    var check= document.getElementsByClassName("check");
    var inputcheck= document.getElementsByClassName("inputcheck");
    var all = document.getElementsByClassName("selectall")[0];
    var reserve = document.getElementsByClassName("reserve")[0];
    var cancel = document.getElementsByClassName("cancel")[0];

    //for循環(huán)閉包
    for(var i=0;i<check.length;i++){
        var td =  check[i];
        td.onclick = function () {
            var td =  check[i];
            return function () {
                var input = td.getElementsByTagName("input")[0];
                if(input.checked){
                    input.checked = false;
                }else {
                     input.checked = true;
                }
            }
        }(i)
    }
    //for循環(huán)閉包
    for(var i=0;i<inputcheck.length;i++){
        var input =  inputcheck[i];
        input.onclick = function () {
            var input =  inputcheck[i];
            return function () {
                if(input.checked){
                    input.checked = false;
                }else {
                     input.checked = true;
                }
            }
        }(i)
    }

    //全選
    all.onclick=function () {
        for(var i=0;i<ele.length;i++){
            ele[i].checked=true;
        }
    }
    //反選
    reserve.onclick=function () {
        for(var i=0;i<ele.length;i++){
            if(ele[i].checked){
                ele[i].checked=false;
            }
            else {
                ele[i].checked=true;
            }
        }
    }
    //取消
    cancel.onclick =function () {
        for(var i=0;i<ele.length;i++){
            ele[i].checked=false;
        }
    }
</script>
</body>
</html>

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