Jquery 在AJAX响应中查找null或空值

这是从jQueryAjax调用返回的AJAX响应。我该如何使用JQuery查看其中是否还有null或空的内容

{"prepaymentList":[{"years":1,"bps":null,"targetRate":0.0236187,"TotalValueString":"","ShockString":"","KeyRate":""},{"years":2,"bps":null,"targetRate":0.0236187,"TotalValueString":"","ShockString":"","KeyRate":""},{"years":3,"bps":null,"targetRate":0.0236187,"TotalValueString":"","ShockString":"","KeyRate":""},{"years":4,"bps":null,"targetRate":0.0236187,"TotalValueString":"","ShockString":"","KeyRate":""},{"years":1,"bps":null,"targetRate":0.0186187,"TotalValueString":"","ShockString":"","KeyRate":""},{"years":2,"bps":null,"targetRate":0.0186187,"TotalValueString":"","ShockString":"","KeyRate":""},{"years":3,"bps":null,"targetRate":0.0186187,"TotalValueString":"","ShockString":"","KeyRate":""},{"years":4,"bps":null,"targetRate":0.0186187,"TotalValueString":"","ShockString":"","KeyRate":""}],"keyRateList":[{"years":1,"bps":null,"targetRate":null,"TotalValueString":"","ShockString":"","KeyRate":"2.51506"},{"years":2,"bps":null,"targetRate":null,"TotalValueString":"","ShockString":"","KeyRate":"3.03467"},{"years":3,"bps":null,"targetRate":null,"TotalValueString":"","ShockString":"","KeyRate":"3.48070"},{"years":4,"bps":null,"targetRate":null,"TotalValueString":"","ShockString":"","KeyRate":"3.87485"}],"stillRunning":true,"prepaymentLength":5}

---

未测试。

首先，您确定这是作为json对象而不是文本字符串返回的吗？使用.ajax完整回调函数：

函数（e）{console.log（e）；}

。请确保在firebug中查看响应时，它是一个对象而不是字符串…它以这种格式返回：return Json（new{preadmentlist=“”，keyRateList=“”，stillRunning=false，preadmentlength=“” });这就阻止了整个事情的进行。当我把它注释出来时，它至少会尝试运行

$.each(prepaymentList, function(index, value) {
    if (value == null || value == ' ') {
        alert(index+" is null!");
    }
}