您可使用以下网址:https://develloper.mozilla.org/en-US/docs/ Web/Java /Reith/Global_omess/Oget/ Values”rel=“no followlow noreferer”>。

The Object.values() method returns an array of a given object s own enumerable property values, in the same order as that provided by a for...in loop (the difference being that a for-in loop enumerates properties in the prototype chain as well).

http://developer.mozilla.org/en-US/docs/Web/Java/Reference/Global_Objects/Array/indexOf”rel=“nofollow noreferer” 方法:

The indexOf() method returns the first index at which a given element can be found in the array, or -1 if it is not present.

例如:

Object.values(obj).indexOf("test") >= 0

更确切的例子如下:

var obj = {
  "a": "test1",
  "b": "test2"
}


console.log(Object.values(obj).indexOf("test1")); // 0
console.log(Object.values(obj).indexOf("test2")); // 1

console.log(Object.values(obj).indexOf("test1") >= 0); // true
console.log(Object.values(obj).indexOf("test2") >= 0); // true 

console.log(Object.values(obj).indexOf("test10")); // -1
console.log(Object.values(obj).indexOf("test10") >= 0); // false

对于一名一班子,我要说:

exist = Object.values(obj).includes("test1");
console.log(exist);

我对所有这些例子进行了测试,我在Node.js v8.11.2上进行了试验。 作为选择最佳选择的指南。

let i, tt;
    const obj = { a:  test1 , b:  test2 , c:  test3 , d:  test4 , e:  test5 , f:  test6  };

console.time("test1")
i = 0;
for( ; i<1000000; i=i+1) {
  if (Object.values(obj).indexOf( test4 ) > -1) {
    tt = true;
  }
}
console.timeEnd("test1")

console.time("test1.1")
i = 0;
for( ; i<1000000 ; i=i+1) {
  if (~Object.values(obj).indexOf( test4 )) {
    tt = true;
  }
}
console.timeEnd("test1.1")

console.time("test2")
i = 0;
for( ; i<1000000; i=i+1) {
  if (Object.values(obj).includes( test4 )) {
    tt = true;
  }
}
console.timeEnd("test2")


console.time("test3")
i = 0;
for( ; i<1000000 ; i=i+1) {
  for(const item in obj) {
    if(obj[item] ==  test4 ) {
      tt = true;
      break;
    }
  }
}
console.timeEnd("test3")

console.time("test3.1")
i = 0;
for( ; i<1000000; i=i+1) {
  for(const [item, value] in obj) {
    if(value ==  test4 ) {
      tt = true;
      break;
    }
  }
}
console.timeEnd("test3.1")


console.time("test4")
i = 0;
for( ; i<1000000; i=i+1) {
  tt = Object.values(obj).some((val, val2) => {
    return val == "test4"
  });
}
console.timeEnd("test4")

console.time("test5")
i = 0;
for( ; i<1000000; i=i+1) {
  const arr = Object.keys(obj);
  const len = arr.length;
  let i2 = 0;
  for( ; i2<len ; i2=i2+1) {
    if(obj[arr[i2]] == "test4") {
      tt = true;
      break;
    }
  }
}
console.timeEnd("test5")

Output on my server

test1:   272.325 ms
test1.1: 246.316 ms
test2:   251.98 0ms
test3:    73.284 ms
test3.1: 102.029 ms
test4:   339.299 ms
test5:    85.527 ms

你可以尝试

var obj = {
  "a": "test1",
  "b": "test2"
};

const findSpecificStr = (obj, str) => {
  return Object.values(obj).includes(str);
}

findSpecificStr(obj,  test1 );

你可以尝试:

function checkIfExistingValue(obj, key, value) {
    return obj.hasOwnProperty(key) && obj[key] === value;
}
var test = [{name : "jack", sex: F}, {name: "joe", sex: M}]
console.log(test.some(function(person) { return checkIfExistingValue(person, "name", "jack"); }));

在新版本中,如果script现在能够用<条码>检查吗?操作。

它对物体或nes物的简单易懂的奥约检查值

var obj = {
   "a": "test1",
   "b": "test2"
}

if(obj?.a) return "i got the value"

Similarly since in Javascript most used primitive type is Object

我们也可以利用这些阵列、职能等。

aFunc = () => { return "gotcha"; }

aFunc?.() // returns gotcha

myArray = [1,2,3]

myArray?.[3] // returns undefined

Thanks

Best way to find value exists in an Object using Object.keys()

obj = {
 "India" : {
 "Karnataka" : ["Bangalore", "Mysore"],
 "Maharashtra" : ["Mumbai", "Pune"]
 },
 "USA" : {
 "Texas" : ["Dallas", "Houston"],
 "IL" : ["Chicago", "Aurora", "Pune"]
 }
}

function nameCity(e){
    var finalAns = []
    var ans = [];
    ans = Object.keys(e).forEach((a)=>{
        for(var c in e[a]){
            e[a][c].forEach(v=>{
                if(v === "Pune"){
                    finalAns.push(c)
                }
            })

        }
    })
    console.log(finalAns)
}


nameCity(obj)

ES2017 introduces a new method called Object.values() that allows you to return an array of own enumerable property’s values of an object.

如果在上存在价值,你可以这样做。 反对:

let found = Object.values(africanCountries).includes( Nigeria );
if (found) {
     // code
}

let found = Object.keys(africanCountries).includes( Nigeria );
if (found) {
     // code
}