我有一个非常简单的JavaScript对象,我将其用作关联数组。是否有一个简单的函数允许我获取值的键,或者我必须迭代对象并手动找到它?
当前回答
这里有一个Lodash解决方案,适用于flat key =>值对象,而不是嵌套对象。已接受的答案建议使用_。findKey适用于具有嵌套对象的对象,但在这种常见情况下不起作用。
这种方法将对象颠倒,将键交换为值,然后通过查找新(颠倒的)对象上的值来查找键。如果没有找到键,则返回false,我更喜欢undefined,但你可以很容易地在_的第三个参数中交换它。getKey()中的get方法。
// Get an object's key by value var getKey = function( obj, value ) { var inverse = _.invert( obj ); return _.get( inverse, value, false ); }; // US states used as an example var states = { "AL": "Alabama", "AK": "Alaska", "AS": "American Samoa", "AZ": "Arizona", "AR": "Arkansas", "CA": "California", "CO": "Colorado", "CT": "Connecticut", "DE": "Delaware", "DC": "District Of Columbia", "FM": "Federated States Of Micronesia", "FL": "Florida", "GA": "Georgia", "GU": "Guam", "HI": "Hawaii", "ID": "Idaho", "IL": "Illinois", "IN": "Indiana", "IA": "Iowa", "KS": "Kansas", "KY": "Kentucky", "LA": "Louisiana", "ME": "Maine", "MH": "Marshall Islands", "MD": "Maryland", "MA": "Massachusetts", "MI": "Michigan", "MN": "Minnesota", "MS": "Mississippi", "MO": "Missouri", "MT": "Montana", "NE": "Nebraska", "NV": "Nevada", "NH": "New Hampshire", "NJ": "New Jersey", "NM": "New Mexico", "NY": "New York", "NC": "North Carolina", "ND": "North Dakota", "MP": "Northern Mariana Islands", "OH": "Ohio", "OK": "Oklahoma", "OR": "Oregon", "PW": "Palau", "PA": "Pennsylvania", "PR": "Puerto Rico", "RI": "Rhode Island", "SC": "South Carolina", "SD": "South Dakota", "TN": "Tennessee", "TX": "Texas", "UT": "Utah", "VT": "Vermont", "VI": "Virgin Islands", "VA": "Virginia", "WA": "Washington", "WV": "West Virginia", "WI": "Wisconsin", "WY": "Wyoming" }; console.log( 'The key for "Massachusetts" is "' + getKey( states, 'Massachusetts' ) + '"' ); <script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.4/lodash.min.js"></script>
其他回答
这里有一个Lodash解决方案,适用于flat key =>值对象,而不是嵌套对象。已接受的答案建议使用_。findKey适用于具有嵌套对象的对象,但在这种常见情况下不起作用。
这种方法将对象颠倒,将键交换为值,然后通过查找新(颠倒的)对象上的值来查找键。如果没有找到键,则返回false,我更喜欢undefined,但你可以很容易地在_的第三个参数中交换它。getKey()中的get方法。
// Get an object's key by value var getKey = function( obj, value ) { var inverse = _.invert( obj ); return _.get( inverse, value, false ); }; // US states used as an example var states = { "AL": "Alabama", "AK": "Alaska", "AS": "American Samoa", "AZ": "Arizona", "AR": "Arkansas", "CA": "California", "CO": "Colorado", "CT": "Connecticut", "DE": "Delaware", "DC": "District Of Columbia", "FM": "Federated States Of Micronesia", "FL": "Florida", "GA": "Georgia", "GU": "Guam", "HI": "Hawaii", "ID": "Idaho", "IL": "Illinois", "IN": "Indiana", "IA": "Iowa", "KS": "Kansas", "KY": "Kentucky", "LA": "Louisiana", "ME": "Maine", "MH": "Marshall Islands", "MD": "Maryland", "MA": "Massachusetts", "MI": "Michigan", "MN": "Minnesota", "MS": "Mississippi", "MO": "Missouri", "MT": "Montana", "NE": "Nebraska", "NV": "Nevada", "NH": "New Hampshire", "NJ": "New Jersey", "NM": "New Mexico", "NY": "New York", "NC": "North Carolina", "ND": "North Dakota", "MP": "Northern Mariana Islands", "OH": "Ohio", "OK": "Oklahoma", "OR": "Oregon", "PW": "Palau", "PA": "Pennsylvania", "PR": "Puerto Rico", "RI": "Rhode Island", "SC": "South Carolina", "SD": "South Dakota", "TN": "Tennessee", "TX": "Texas", "UT": "Utah", "VT": "Vermont", "VI": "Virgin Islands", "VA": "Virginia", "WA": "Washington", "WV": "West Virginia", "WI": "Wisconsin", "WY": "Wyoming" }; console.log( 'The key for "Massachusetts" is "' + getKey( states, 'Massachusetts' ) + '"' ); <script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.4/lodash.min.js"></script>
http://jsfiddle.net/rTazZ/2/
var a = new Array();
a.push({"1": "apple", "2": "banana"});
a.push({"3": "coconut", "4": "mango"});
GetIndexByValue(a, "coconut");
function GetIndexByValue(arrayName, value) {
var keyName = "";
var index = -1;
for (var i = 0; i < arrayName.length; i++) {
var obj = arrayName[i];
for (var key in obj) {
if (obj[key] == value) {
keyName = key;
index = i;
}
}
}
//console.log(index);
return index;
}
我们可以使用简单的函数来获取传递的值
const getKeyByValue = (object, value) => Object.keys(object).find(key => object[key] === value)
我使用这个函数:
Object.prototype.getKey = function(value){
for(var key in this){
if(this[key] == value){
return key;
}
}
return null;
};
用法:
// ISO 639: 2-letter codes
var languageCodes = {
DA: 'Danish',
DE: 'German',
DZ: 'Bhutani',
EL: 'Greek',
EN: 'English',
EO: 'Esperanto',
ES: 'Spanish'
};
var key = languageCodes.getKey('Greek');
console.log(key); // EL
下划线js解决方案
let samplLst = [{id:1,title:Lorem},{id:2,title:Ipsum}]
let sampleKey = _.findLastIndex(samplLst,{_id:2});
//result would be 1
console.log(samplLst[sampleKey])
//output - {id:2,title:Ipsum}