JS通过类名判断是否都必填

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//判断class='required' 是否都必填 function required() {     var flag = true;     $(".required").each(function () {         if ($(this).val() == '') {             var posi = $(this).data('info');             layer.msg(posi + "为必填信息");             flag = false;             ;         }         if (!flag) {             return flag;         }     })     return flag; }