How layui gets the value of the checkbox and how to assign a value to the checkbox

=========================================HTML=============================================
<div class="layui-form-item">
   <div class="layui-col-md12">
         <div>
               <label class="layui-form-label">类型</label>
               <div class="layui-input-block">
                    <input type="checkbox" name="AllDay" id="AllDay" lay-filter="test1" value="全天" title="全天">
                    <input type="checkbox" name="IsEnd" id="IsEnd" lay-filter="test1" value="结束时间" title="结束时间">
               </div>
         </div>
        <span></span>
   </div>
</div>

========================================JS=============================================
var allDayCheck = document.getElementById("AllDay").checked;
var isEndCheck = document.getElementById("IsEnd").checked;

//HTML代码

<form class="layui-form">
    <div class="layui-form-item">
        <label class="layui-form-label">复选框</label>
        <div class="layui-input-block">
            <input type="checkbox" name="like" value="1" title="写作">
            <input type="checkbox" name="like" value="2" title="阅读" >
            <input type="checkbox" name="like" value="3" title="发呆">
        </div>
    </div>
    <div class="layui-form-item">
        <div class="layui-input-block">
            <button class="layui-btn" lay-submit lay-filter="formDemo">立即提交</button>
            <button type="reset" class="layui-btn layui-btn-primary">重置</button>
        </div>
    </div>
</form>

 

//JS代码

<script>
    layui.use(&#39;form&#39;, function(){
        var form = layui.form;
        form.on(&#39;submit(formDemo)&#39;, function(data){

            //获取checkbox[name=&#39;like&#39;]的值
            var arr = new Array();
            $("input:checkbox[name=&#39;like&#39;]:checked").each(function(i){
                arr[i] = $(this).val();
            });
            data.field.like = arr.join(",");//将数组合并成字符串

            $.post("admin.php", {data:data.field}, function (res) {
                if (res.code == 1) {
                    layer.msg(res.msg, {time: 1800, icon: 1}, function () {
                        location.href = res.url;
                    });
                } else {
                    layer.msg(res.msg, {time: 1800, icon: 2});
                }
            }, &#39;json&#39;);

            return false;
        });
    });
</script>

 layui.use('form', function () {
     form = layui.form;
     $('#AllDay').prop("checked", true); //先进行基本赋值                          
     form.render(); //这句必须（用来更新渲染页面）
});