js 隐藏邮箱中间几位详解编程语言

// 替换邮箱字符 
    const regEmail = (email) => {
    
      if (String(email).indexOf('@') > 0) {
    
        let str = email.split('@'), 
          _s = '' 
        if (str[0].length > 3) {
    
          for (let i = 0; i < str[0].length - 3; i++) {
    
            _s += '*' 
          } 
        } 
        var new_email = str[0].substr(0, 3) + _s + '@' + str[1] 
      } 
      return new_email 
    }