它显示“未捕获 TypeError：无法读取未定义的属性‘push’” 我觉得我没有以正确的方式初始化数组，请帮忙。

var validationInfo = new Array();
var currentStep = 1;
validationInfo["step1"].push({ elementId: "txtsearchBar",       validateFunc: isEmpty });
validationInfo["step2"].push({ elementId: "txtdetails",         validateFunc: isEmpty });  
function isEmpty(element) {
    //alert(element);
    return $(element).val() == undefined || $(element).val() == "";
}
function isCurrentSubmissionValid(stepId) {
    var isOK = true;
    alert(validationInfo);
    for (var i = 0; i < validationInfo[stepId].length; i++) {
        var element = $("#" + validationInfo[i].elementId);
        var validationFunction = validationInfo[i].validateFunc;
        if (!validationFunction(element)) {
            element.addClass("has-error").removeClass("has-success");
            isOK = false;
        } else
        {
            element.addClass("has-success").removeClass("has-error");
        }
    }
    return isOK;
}