JQuery循环遍历JSON，每个对象返回错误

Question

试图循环返回一些返回的JSON数据，如果返回的值分别为html元素attr，则将“checked”添加到复选框，但这会导致错误。

$('.varUserSettingTable tr').each(function(index, el) {
    var $this = $(this);
    $.each(curdata.VarUserDetails.VARS, function(index, value) {
        if (curdata.VarUserDetails.VARS[index] !== null) {
            if ($this.find('.SettingCheckbox').attr('name') === curdata.VarUserDetails.VARS[index].userID) {
                $this.find('.SettingCheckbox').prop('checked', true);
            }
        }
    });
});

抛出错误“Uncaught TypeError：无法读取未定义的属性'userID'”

在if statmenet上确认.userID！== null

VarUserDetails: Object
VARS:Array[1024]
    [0 … 99]
        0:null
        1:null
        2:Object
            userChecked:1
            userID:"2"
            __proto__:Object
        3:Object
            userChecked:1
            userID:"3"
            __proto__:Object
        ...
        ...

Answer 1

value本身就是数组的项目。尝试使用value代替curdata.VarUserDetails.Vars[index]

$('.varUserSettingTable tr').each(function(index, el) {
var $this = $(this);
$.each(curdata.VarUserDetails.VARS, function(index, value) {
    if (value  !== null) {
        if ($this.find('.SettingCheckbox').attr('name') === value.userID) {
            $this.find('.SettingCheckbox').prop('checked', true);
        }
    }
});