SOURCE

/**
 * @param {number} n
 * @return {string[]}
 */
var generateParenthesis = function(n) {
  let str = 1.0.toFixed(n).substr(2).replace(/0/g, '(')
  let _case = []
  let result = []
  //console.log(str, _case)
  let num = n //剩下的
  let m = n
  let i = 0
  
  while(i < n){
   
    i++
  }
 for(let j=n; j>=0; j--){
  _case.push( str.substr(0, j) )
  num -= j
}
  return result
};
try{
  console.log(generateParenthesis(5))
}catch(e){
  console.log(e)
}