const source = [10, 3, 35, 24, 10, 9, 23, 14, 15, 56]
   const target = 23
   source.sort((a, b) => a - b)
   console.log(`source: ${source}`)
   console.log(`target: ${target}`)
   
   /**
    * 破二分搜索
    * @param {Array[int]} array 源数组
    * @param {int} low 搜索下界
    * @param {int} high 搜索上界
    * @param {int} target 搜索目标
    */
   function BinarySearch (array, low, high, target) {
     if (low > high) {
       return false
     }
     let mid = Math.floor((high + low) / 2)
     if (array[mid] > target) {
       return BinarySearch(array, low, mid - 1, target)
     } else if (array[mid] < target) {
       return BinarySearch(array, mid + 1, high, target)
     } else {
       return mid
     }
   }
   
   console.log(`result: ${BinarySearch(source, 0, source.length, target) + 1}`)