jQuery 在多维数组中查找/设置对象时遇到问题

Question

我正在尝试使用 jquery 循环选择并根据以下值创建一个二维数组：

使用我想要的输出下方的代码将如下所示：

object {Monday => hours[0] = '1a-2a',hours[1] = '2a-3a', Tuesday => hours[0] = '4p-5p', hours[1] = '5p-6p'}

假设我的 .each 选择器看起来像这样：

<ol id='selectable'>
   <li data-day='Monday' data-time='1a-2a' class='ui-selected'></li>
   <li data-day='Monday' data-time='2a-3a' class='ui-selected'></li>
   <li data-day='Tuesday' data-time='4p-5p' class='ui-selected'></li>
   <li data-day='Tuesday' data-time='5p-6p' class='ui-selected'></li>
</ol>

我正在尝试使用下面的代码来获得我想要的输出，但我一直收到错误消息：

"TypeError: Cannot use 'in' operator to search for 'hours' in undefined(…)"

var days = new Array('Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday');
var selection = [];
var i;
    for (i = 0; i < days.length; ++i) {
        $( ".ui-selected", "#selectable" ).each(function() {
            if($(this).attr( 'data-day' ) == days[i]){
                if(!(days[i] in selection)){
                    selection.push(days[i]);
                    if(!("hours" in selection[days[i]])){
                        selection[days[i]] = {hours:[]};
                    }
                }
                selection[days[i]]['hours'].push($(this).attr( 'data-time' ));
            }
        });
        console.log(selection);
    }

知道我做错了什么吗？

Answer 1

你需要 selection 是一个对象，而不是一个数组，像这样：

var days = ['Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday'];
var selection = {};
var i;
for (i = 0; i < days.length; ++i) {
    $( ".ui-selected", "#selectable" ).each(function() {
        if($(this).data( 'day' ) == days[i]){
            if(!(days[i] in selection)){
                selection[days[i]] = {};
                if(!("hours" in selection[days[i]])){
                    selection[days[i]] = {hours:[]};
                }
            }
            selection[days[i]]['hours'].push($(this).data( 'time' ));
        }
    });
    console.log(selection);
}

在这里 fiddle 工作：https://jsfiddle.net/wehdnm20/1/

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