如何判断jQuery中JSON对象是否为空 [英] How to tell if JSON object is empty in jQuery

问题描述

我有以下JSON:

{
    "meta": {
        "limit": 20,
        "next": null,
        "offset": 0,
        "previous": null,
        "total_count": 0
    },
    "objects": []
}

我对对象感兴趣:我想知道对象是否为空并显示警报:

I'm interested in objects: I want to know if objects is empty and show an alert:

类似这样的东西:

success: function (data) {
    $.each(data.objects, function () {
        if data.objects == None alert(0)
        else :alert(1)
    });

推荐答案

使用Array的

Use Array's length property:

// note: you don't even need '== 0'

if (data.objects.length == 0) {
  alert("Empty");
}
else {
  alert("Not empty");
}

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