数据结构--字符串

数字字符串转成数字

      function strNumberToNumber (s) {
        let i = 0
        let res = 0
        while (i < s.length && s[i] >= '0' && s[i] <= '9') {
          // ans = ans * 10 + (s[i++] - '0');
          let cur = +s[i] //字符串转整数
          res = res * 10 + cur
          i++
        }
        return res
      }
      const s = '4193'
      const result = strNumberToNumber(s)
      console.log('result', result) //4193