在JavaScript对象中查找值 [英] Find a value in a JavaScript object

问题描述

我有一个如下所示的javascript对象:

I have a javascript object which looks like this:

tabAndFieldLink: {
    'key1': ['value11', 'value12', 'value13', 'value14', 'value15'],
    'key2': ['value21', 'value22', 'value23', 'value24', 'value25', 'value26', 'value27'],
    'key3': ['value31', 'value32', 'value33', 'value34'],
    'key4': ['value41', 'value42'],
}

我想要的

我有值 value22 ，我想获取它的密钥，即 key2 .

I have the value value22 and I want to get it's key i.e. key2.

我尝试过的事情

for (err in errorArray) {
    //err contain the value i.e. value22
    var resultObject = search(err, tabAndFieldLink);
    console.log("The result is :", resultObject);
}

function search(nameKey, myArray) {
    for (var i = 0; i < myArray.length; i++) {
        if (myArray[i].indexOf(nameKey) !== -1) {
            return myArray[i];
        }
    }
}

但是它正在打印结果为:"，未定义.如何获取密钥?

But it is printing "The result is :", undefined. How can I get the key?

谢谢.

推荐答案

您应使用

You should use for...in statement to iterates over the enumerable properties of object tabAndFieldLink and as you need key return it.

for (key in obj) {
    if (obj[key].indexOf(nameKey) !== -1) {
        return key;
    }
}

var tabAndFieldLink = {
  'key1': ['value11', 'value12', 'value13', 'value14', 'value15'],
  'key2': ['value21', 'value22', 'value23', 'value24', 'value25', 'value26', 'value27'],
  'key3': ['value31', 'value32', 'value33', 'value34'],
  'key4': ['value41', 'value42'],
}

//err contain the value i.e. value22
var err = 'value22';
var resultObject = search(err, tabAndFieldLink);
console.log("The result is :", resultObject);

function search(nameKey, obj) {
  for (key in obj) {
    if (obj[key].indexOf(nameKey) !== -1) {
      return key;
    }
  }
}

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