JS中密码用正则表达式校验

实时检测输入的密码手机否符合规范<!DOCTYPE html><html lang="en"><head><meta charset="UTF-8"><meta http-equiv="X-UA-Compatible" content="IE=edge"><meta name="viewport" content="width=de

辰辰北

5663人浏览 · 2021-12-26 15:23:26

辰辰北 · 2021-12-26 15:23:26 发布

实时检测输入的密码手机否符合规范
在这里插入图片描述

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    *{margin: 0; padding: 0;}
    #div1{
      width: 200px;
      height: 200px;
      background-color: orange;
      border: 1px sloid black;
      padding: 50px;
      margin: 150px auto;
      text-align: center;
    }
    #div1 input{
      width: 200px;
      height: 30px;
      font-size: 18px;
      margin-bottom: 5px;
      margin-top: 10px;
    }
    #div1 span{
      font-size: 14px;
      color: gray;
    }
    #div2 span{
      display: block;
      width: 50px;
      height: 20px;
      background-color: gainsboro;
      color: black;
      float: left;
      margin-left: 15px;
    }
    #div2 {display: none;}
    #div2 .active{
      background-color: pink;
      color: white;
    }
  </style>
</head>
<body>
  <div id="div1">
    <input type="text" placeholder="用户名" id="username">
    <span id="usernameinfo">6-18个字符，可使用数字、字母、下划线，需以字母开头</span>
    <input type="text" placeholder="密码" id="password">
    <div id="div2">
      <span class=".active">弱</span>
      <span>中</span>
      <span>强</span>
    </div>
    <span id="passwordinfo">6-18个字符，区分大小写</span>

  </div>
  <script>
    window.onload = function() {
      // 正则表单案例2
      var oUserName = document.querySelector('#username')
      var oUserName_span = document.querySelector('#usernameinfo')
      var oPassWord = document.querySelector('#password')
      var oPassWord_span = document.querySelector('#passwordinfo')
      var aSpans = document.querySelectorAll('#div2 span')
      var oDiv2 =   document.querySelector('#div2')
      // oUserName失去焦点事件
      oUserName.onblur = () => {
        var oValue = oUserName.value
        if(oValue) {
          // 1、判断长度
          if(oValue.length > 18 || oValue.length < 6) {
            oUserName_span.innerText = '长度应为6~18个字符'
            oUserName_span.style.color = 'red'
          }else if(!/[a-zA-Z]/.test(oValue[0])) { // 2、首字符不是字母
            oUserName_span.innerText = '用户名必须是英文开头'
            oUserName_span.style.color = 'red'
          }else if(/\W/.test(oValue)) { // 3、用户名必须是数字、字母、下划线组成
            oUserName_span.innerText = '用户名只能包括数字字母下划线'
            oUserName_span.style.color = 'red'
          }else{
            oUserName_span.innerText = '用户名√'
            oUserName_span.style.color = 'green'
          }
        }
      }
      // 密码组成：纯数字、纯大小写字母
      // 密码强度：一种：弱； 两种组成：中； 三种混合：强
      
      oPassWord.onkeyup = () => {
        var oValue = oPassWord.value
        // 密码长度校验
        if(oValue.length >= 6){
          oDiv2.style.display = 'block'
        }else{
          oDiv2.style.display = 'none'
        }
        // 清除清除上一次密码检验的结果
        for(let i=0; i<aSpans.length; i++){
          aSpans[i].className = ''
        }
        // 密码强度校验
        if(/^\d+$/.test(oValue) || /^[a-z]+$/.test(oValue) || /^[A-Z]+$/.test(oValue)){
          aSpans[0].className = 'active' // 弱
        } else if(/\d+/.test(oValue) && /[a-z]+/.test(oValue) && /[A-Z]+/.test(oValue)) {
          aSpans[2].className = 'active' //强
        } else {
          aSpans[1].className = 'active' // 中
        }
      }
    }
  </script>
</body>
</html>