Question

我有这个JSON：

CLASSPATH

我希望使用特定的{ "1": { "PerId":"10900662", "Name":"Cueball", "Email":"cueb@example.com", "DepartId":"11" }, "2": { "PerId":"10900664", "Name":"Megan", "MuEmail":"megan@example.com", "DepartId":"11" }, "3": { "PerId":"10900665", "Name":"Beret Guy", "MuEmail":"bg@example.com", "DepartId":"12" } }

进行过滤

这是我测试过的代码，来自this Stack Overflow question：

DepartId

在这种情况下，y返回一个对象，但Firefox抛出<html> <body> Test! </body> <script> var y = JSON.parse('{"1":{"PerId":"10900662","Name":"Cueball","Email":"cueb@example.com","DepartId":"11"},"2": {"PerId":"10900664","Name":"Megan","MuEmail":"megan@example.com","DepartId":"11"},"3": {"PerId":"10900665","Name":"Beret Guy","MuEmail":"bg@example.com","DepartId":"12"}}'); var z = y.filter(function (i,n){return n.DepartId == '11'}) </script> </html>

的错误

我希望你能像

那样回归

y.filter is not a function.

以JavaScript对象的形式。我如何使它工作？

Answer 1

filter()在Array原型上定义。它不能用在对象上。

您可以使用Object.keys()获取对象和for循环中的所有键以迭代它们。

// Get all keys from the `obj`
var keys = Object.keys(obj),
    result = {};


// Iterate over all properties in obj
for (var i = 0, len = keys.length; i < len; i++) {
    // If the ID is to be filtered
    if (obj[keys[i]].DepartId === '11') {

        // Add the object in the result object
        result[keys[i]] = obj[keys[i]];
    }
}

＆＃13;

var obj = {
    "1": {
        "PerId": "10900662",
        "Name": "Cueball",
        "Email": "cueb@example.com",
        "DepartId": "11"
    },
    "2": {
        "PerId": "10900664",
        "Name": "Megan",
        "MuEmail": "megan@example.com",
        "DepartId": "11"
    },
    "3": {
        "PerId": "10900665",
        "Name": "Beret Guy",
        "MuEmail": "bg@example.com",
        "DepartId": "12"
    }
};

var keys = Object.keys(obj),
    result = {};

for (var i = 0, len = keys.length; i < len; i++) {
    if (obj[keys[i]].DepartId === '11') {
        result[keys[i]] = obj[keys[i]];
    }
}

console.log(result);
document.body.innerHTML = '<pre>' + JSON.stringify(result, 0, 4);

＆＃13;

我建议更改数据格式以使用对象数组。然后filter()可以直接应用于数组。

var arr = [{
    "PerId": "10900662",
    "Name": "Cueball",
    "Email": "cueb@example.com",
    "DepartId": "11"
}, {
    "PerId": "10900664",
    "Name": "Megan",
    "MuEmail": "megan@example.com",
    "DepartId": "11"
}, {
    "PerId": "10900665",
    "Name": "Beret Guy",
    "MuEmail": "bg@example.com",
    "DepartId": "12"
}];

var result = arr.filter(obj => obj.DepartId === '11');
console.log(result);

＆＃13;

var arr = [{
    "PerId": "10900662",
    "Name": "Cueball",
    "Email": "cueb@example.com",
    "DepartId": "11"
}, {
    "PerId": "10900664",
    "Name": "Megan",
    "MuEmail": "megan@example.com",
    "DepartId": "11"
}, {
    "PerId": "10900665",
    "Name": "Beret Guy",
    "MuEmail": "bg@example.com",
    "DepartId": "12"
}];

var result = arr.filter(obj => obj.DepartId === '11');

console.log(result);
document.body.innerHTML = '<pre>' + JSON.stringify(result, 0, 4);

＆＃13;

Answer 2

您尝试在对象上使用数组过滤器。再看看这个例子。

$([ // this is an array of objects
    {"name":"Lenovo Thinkpad 41A4298","website":"google222"},
    {"name":"Lenovo Thinkpad 41A2222","website":"google"}
  ])
    .filter(function (i,n){
        return n.website==='google';
    });

Answer 3

filter是数组函数的原型而不是object，所以我们不能在这里使用。

要实现输出，我们可以在for-in

上使用object循环

var y = JSON.parse('{"1":{"PerId":"10900662","Name":"Cueball","Email":"cueb@example.com","DepartId":"11"},"2": {"PerId":"10900664","Name":"Megan","MuEmail":"megan@example.com","DepartId":"11"},"3": {"PerId":"10900665","Name":"Beret Guy","MuEmail":"bg@example.com","DepartId":"12"}}');

var res = {}
for(var key in y){
  if(y[key].DepartId === '11')
   res[key] = y[key]
}
console.log(res)

过滤具有特定值的数组

3 个答案: