两道Javascript-前端面试题-蒲公英云

两道Javascript-前端面试题

第一题

请完成一个函数，接受字符串str，返回一个相对应的json对象。（例如str＝”aa.bb.cc”，函数返回{“aa”:{“bb”:{“cc”:{}}}} ）

function getJson(str) { 
  let strArr = str.split('.');
  let getObj = function(obj, index) { 
    obj[strArr[index]] = {};
    if (index !== strArr.length - 1){
      getObj(obj[strArr[index]], ++index);
    }
    return obj;
  };
  let obj = getObj({}, 0);
  return obj;
}

第二题

假设已知一个函数
function isPass() {
…
return true/false;
}
请完成函数function X() {…}
使得当我在main函数中调用X()时，在控制台打印出这样的一段话
try to run isPass for 1 times, fail, wait for 10 seconds to try again…
try to run isPass for 2 times, fail, wait for 15 seconds to try again…
try to run isPass for 3 times, fail, wait for 20 seconds to try again…
…
try to run isPass for n times, succeed, over!

function x() {
  var times = arguments[0] || 1;
  if(isPass()) {
    console.log(`try to run isPass for ${
   times} times, succeed, over!`);
  } else {
    console.log(`try to run isPass for ${
   times} times, fail, wait for ${
   10 + times * 5} to try again...`);
    setTimeout(() => {
      times++;
      x(times);
    }, (1 * times) * 1000);
  }
}
function isPass() {
 return true/false;
}
function main() {
  x();
}
main();