let key = "211_01_13_50";
function geiUri(key) {
let firstPos = key.indexOf("_");
let secondPos = key.indexOf("_", firstPos + 1);
console.log(firstPos + "," + secondPos)
let res = key.slice(firstPos + 1, secondPos);
console.log(res);
console.log("-----------------");
}
geiUri(key);
function getLastKey(key){
let lastPos = key.lastIndexOf("_");
let res = key.slice(lastPos+1);
console.log(res);
}
getLastKey(key);