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383. 赎金信

给你两个字符串:ransomNote 和 magazine ,判断 ransomNote 能不能由 magazine 里面的字符构成。

如果可以,返回 true ;否则返回 false 。

magazine 中的每个字符只能在 ransomNote 中使用一次。

示例 1:
输入:ransomNote = "a", magazine = "b"
输出:false

示例 2:
输入:ransomNote = "aa", magazine = "ab"
输出:false

示例 3:
输入:ransomNote = "aa", magazine = "aab"
输出:true

提示:
1 <= ransomNote.length, magazine.length <= 105
ransomNote 和 magazine 由小写英文字母组成

javascript
/**
 * @param {string} ransomNote
 * @param {string} magazine
 * @return {boolean}
 */
var canConstruct = function (ransomNote, magazine) {
  if (ransomNote.length > magazine.length) return false
  var magazineArr = magazine.split("")
  for (var i = 0; i < ransomNote.length; i++) {
    var ele = ransomNote[i]
    var index = magazineArr.indexOf(ele)
    if (index === -1) {
      return false
    } else {
      magazineArr[index] = "-"
    }
  }
  return true
}
console.log(canConstruct("a", "b"))
console.log(canConstruct("aa", "ab"))
console.log(canConstruct("aa", "aab"))