解析字串

const extractStr = (str) => {
  let result = [],
      pattern = /:+(w*).+/g,
      temp = null
  while(temp = pattern.exec(str)){
    result.push(temp[1])
  }
  return result
}

　　例如：extractStr('My name is:Jerry. My age is:12.') // => ['Jerry', '12']