Question

我有一个看起来像

的JSON对象

{
    "1F54716": [],
    "1258820b-guid": [
        {
            "value": "true",
            "property": "",
            "say": "Hello",

        },
        {
            "value": "false",
            "property": "",
            "say": "Hello",

        }
    ],

}

有没有办法可以通过＆＃34;值＆＃34;：＆＃34; true＆＃34;来过滤这个，所以只有值，其中value = true，然后我想要一个say =的计数你好。非常感谢您的帮助，javascript世界的新手

Answer 1

var theObject = {"1F54716": [], "1258820b-guid": [
    {"value": "true", "property": "", "say": "Hello"},
    {"value": "false", "property": "", "say": "Hello"},
    {"value": "true", "property": "", "say": "Bye"},
    {"value": "true", "property": "", "say": "Hello"}
]}; // Array has 3 value "true" objects and 2 of them count as say "Hello".

function extractArrayWithValueAndSay(obj) {
    for (var k in obj) {
        if (obj[k] && obj[k].length && "value" in obj[k][0] && "say" in obj[k][0]) {
            return obj[k];
        }
    }
    return [];
}

var sourceArray = extractArrayWithValueAndSay(theObject);

var filteredValueTrueArray = sourceArray.filter(function (obj) {
    return obj && obj.value == "true";
});

var filteredSayHelloCount = filteredValueTrueArray.filter(function (obj) {
    return obj && obj.say == "Hello";
}).length;

Answer 2

您可以使用Array#filter检查该属性。

display: block;

Answer 3

类似的东西：

function filterObj(obj) {
  let res = {};
  let res.count = 0;
  // iterate through all keys in the object
  Object.keys(obj).forEach( k => {  
    // if this sub-object has 
    res[k] = obj[k].filter(o => {
    // if say = hello increment our counter by 1. Otherwise it stays the same
    res.count += o.say === 'hello' ? 1 : 0;
    // if the  object has value === true, keep it in our final results
    return o.value === "true";
   });
  );
  // res.count is the number of say === 'hello'
  // and res contains only objects with value === 'true' 
  return res;
}

应该有效。另一个解决方案是JSON解析对象，并使用o.value作为测试来保留它，这取决于你是否计划继续在JS中处理这个对象或者接下来将它序列化。

Answer 4

我建议使用Underscore.js框架。它提供了多种方法将数据搜索到javascript数组中。

    var obj =  {
"1F54716": [],
"1258820b-guid": [
    {
        "value": "true",
        "property": "",
        "say": "Hello",

    },
    {
        "value": "false",
        "property": "",
        "say": "Hello",

    }
],
}
var result = _.where(obj["1258820b-guid"], { value : "true"});

这里是Official website Underscorejs，可以继续阅读。

如何使用node.js中的属性过滤Json数据

4 个答案: