我试图通过 API 显示价值。我想在模板中显示 question_section 名称。我多次获取这些值意味着json中的Array对象。所以有一次我得到的价值 question_section 就像＆＃34; A：ABC Xyz ＆＃34;但接下来的5次 null 值再次出现＆＃34; B：DEF pqr ＆＃34;和5次 null 值。
因此，当我尝试在我的模板中显示此内容时，请未定义或 null 。 我使用 JSON.stringfy（value1.question_section）然后为null，因为所有值都为null。这里我注意到它是最后一个索引（第四个索引）的打印值，但它应该打印零索引。
我的Vue代码js
$.each(this.questionPaperAll, function( key, value) {
$.each(value.questions, function( key1, value1) {
if( JSON.stringify( value1.question_section) )
{
title = "<div style='font-weight: bold;padding-bottom: 10px'>"
+ JSON.stringify( value1.question_section) +" " +
value1.section_marks + "</div>\n" +
"<div style='font-weight: bold;padding-bottom: 10px'>" +
s_no + ") " + value1.question_type_name[0].name + "
</div>\n"
}
});
});
我的API Json Response ::我无法在这里显示完整的响应它只是我面临问题的样本..
[ {
"question_type_name": "4",
"questions": [
{
"question_ref_id": "DndoURx54fj7HaSF",
"question_section": "A : Attempt All question.",
"section_marks": "10",
"question_name": "economics Question 122",
},
{
"question_ref_id": "8wFqcPBVruJSvYKv",
"question_section": "",
"section_marks": "10",
"question_name": "economics Question 127",
},
{
"question_ref_id": "VU4xhxMYO5pdGkNM",
"question_section": "",
"section_marks": "10",
"question_name": "economics Question 128",
},
{
"question_ref_id": "VU4xhxMYO5pdGkNM",
"question_section": "",
"section_marks": "10",
"question_name": "economics Question 128",
},
{
"question_ref_id": "VU4xhxMYO5pdGkNM",
"question_section": "",
"section_marks": "10",
"question_name": "economics Question 128",
}
]
},
{
"question_type_name": "1",
"questions": [
{
"question_ref_id": "e0NGIyFmsQ5EEKiX",
"question_section": "",
"section_marks": null,
"question_name": "economics Question 333",
},
{
"question_ref_id": "e0NGIyFmsQ5EEKiX",
"question_section": "",
"section_marks": null,
"question_name": "economics Question 333",
},
{
"question_ref_id": "e0NGIyFmsQ5EEKiX",
"question_section": "",
"section_marks": null,
"question_name": "economics Question 333",
},
{
"question_ref_id": "e0NGIyFmsQ5EEKiX",
"question_section": "",
"section_marks": null,
"question_name": "economics Question 333",
},
{
"question_ref_id": "e0NGIyFmsQ5EEKiX",
"question_section": "",
"section_marks": null,
"question_name": "economics Question 333",
},
]
},
{
"question_type_name": "3",
"questions": [
{
"question_ref_id": "oALoJ2nCzQm2EBbA",
"question_section": "B : Attempt Only 5 Question from each Question.",
"section_marks": "20",
"question_name": "economics Question 11w",
"marks": "1",
},
{
"question_ref_id": "YUrzwnrW2o0nXMD8",
"question_section": "",
"section_marks": "20",
"question_name": "economics Question 12l",
"marks": "1",
},
{
"question_ref_id": "YUrzwnrW2o0nXMD8",
"question_section": "",
"section_marks": "20",
"question_name": "economics Question 12l",
"marks": "1",
},
{
"question_ref_id": "YUrzwnrW2o0nXMD8",
"question_section": "",
"section_marks": "20",
"question_name": "economics Question 12l",
"marks": "1",
},
{
"question_ref_id": "YUrzwnrW2o0nXMD8",
"question_section": "",
"section_marks": "20",
"question_name": "economics Question 12l",
"marks": "1",
},
{
"question_ref_id": "YUrzwnrW2o0nXMD8",
"question_section": "",
"section_marks": "20",
"question_name": "economics Question 12l",
"marks": "1",
}
]
},
{
"question_type_name": "2",
"questions": [
{
"question_ref_id": "KztHaRUnRCLZwx8U",
"question_section": "",
"section_marks": null,
"question_name": "economics Question 5",
"marks": "1",
},
{
"question_ref_id": "KztHaRUnRCLZwx8U",
"question_section": "",
"section_marks": null,
"question_name": "economics Question 5",
"marks": "1",
},
{
"question_ref_id": "KztHaRUnRCLZwx8U",
"question_section": "",
"section_marks": null,
"question_name": "economics Question 5",
"marks": "1",
},
{
"question_ref_id": "KztHaRUnRCLZwx8U",
"question_section": "",
"section_marks": null,
"question_name": "economics Question 5",
"marks": "1",
},
{
"question_ref_id": "KztHaRUnRCLZwx8U",
"question_section": "",
"section_marks": null,
"question_name": "economics Question 5",
"marks": "1",
},
{
"question_ref_id": "KztHaRUnRCLZwx8U",
"question_section": "",
"section_marks": null,
"question_name": "economics Question 5",
"marks": "1",
},
]
}]
这是了解问题的示例回复。你可以看到那个值的数组。其中数组问题具有键 question_section ，该值首次出现一些字符串，但在新部分未到之前全部为空。所以我只想显示那些 question_section 的值，其余的值则表示不显示。为此，我使用如果条件，但它现在正在工作。为什么我不知道？所以请更正可能代码。还解释了出了什么问题。
我还想告诉我，当我尝试检查哪个问题数组的索引正在打印时。我看到索引4是第一个数组的最后一个索引。为什么它打印最后。
questionPaperAll 是我从服务器获取API响应的数组。
答案 0 :(得分：-1)
您发布的内容有很多错误。首先，您的问题中没有任何内容与PHP，Laravel-5，Vue.js或Restful-URL有任何关系。其次，如果您使用的是Vue，那么您不应该在JavaScript中构建HTML字符串 - 这就是模板的用途。
虽然你的问题措辞不够且相当冗长，但看起来你的问题是你的if声明会返回误报。
您的问题是在空字符串上调用JSON.stringify会返回两个双引号的字符串""。您可以尝试在控制台中运行以下内容，结果是2：console.log(JSON.stringify('').length);。
无需致电JSON.stringify。您可以简单地依赖空字符串的falsiness：
if (value1.question_section) {
/* TODO: Conditional code goes here. */
}
我建议您编辑您的问题，以便明确这是关于使用JSON.stringify和而不是关于Vue.js。