data = {
"bqw":"123",
"bfr": "1234",
"asq": "1235",
"ase":"1236",
"bd": "1237",
"bua": "123",
"bgg": "1238",
"bug": "1239",
};/ / determine whether the values of different key of the object data are duplicated, and if there is an alert "repeat"
the subject has asked ES6, why is there no answer?
const data = {
"bqw":"123",
"bfr": "1234",
"asq": "1235",
"ase":"1236",
"bd": "1237",
"bua": "123",
"bgg": "1238",
"bug": "1239",
};
// ES7
Object.values(data).length !== new Set(Object.values(data)).size && console.log('')
// ES6
const values = Object.keys(data).map(e => data[e])
values.length !== new Set(values).size && console.log('')
// console.log alertwrite a method to recreate an object with the value of data as the key value;
function run(obj){
let md={};
for(k in obj){
md[obj[k]]? md[obj[k]]PP: md[obj[k]]=1
}
return md;
}
//value
run(data)//123: 2, 1234: 1, 1235: 1, 1236: 1, 1237: 1, 1238: 1, 1239: 1let check = (data) = > {
let arr = []
for (let k in data) {
if (arr.indexOf(data[k]) === -1) {
arr.push(data[k])
} else {
return true
}
} }
let data = {
"bqw": "123",
"bfr": "1234",
"asq": "1235",
"ase": "1236",
"bd": "1237",
"bua": "123",
"bgg": "1238",
"bug": "1239"}
if (check (data)) {
alert('')}
/ / true
is probably an array that temporarily stores the value of object. Indexof determines whether the next value exists in the array, and returns true
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