提取 Object 类型中值是 true 的 key

const message = { 1: true, 2: true, 3: false };
const arr = [];
for (let item in message) {
    if (message[item]) {
        arr.push(item);
    }
}
console.log(arr.join(','));


const array = { 1: true, 2: true, 3: false };
let str = Object.keys(array).filter(value => {
    return array[value]
}).join(',')
console.log(str)


//将string和number转换为相应的boolean值
getBool(value) {
    return !!JSON.parse(String(value).toLowerCase());
}