邮箱验证

    1.  <input type="" name="" id="emial" placeholder="请输入邮箱">
    2.     <script>
    3.         var emial=document.getElementById("emial");
    4.         emial.onkeydown=function(){
    5.             if(event.keyCode==13){
    6.                 var value=this.value.trim();
    7.                 var reg=/^[\w]+@[0-9a-z]+\.[a-z]+$/;
    8.                 console.log(reg.test(value));
    9.             }
    10.         }
    11. </script>

    银行卡密码验证

    1. <input type="password" id="input2" placeholder="请输入密码" >
    2.   <script>
    3.             //密码验证
    4.           var input=document.getElementById("input2");
    5.           input2.onkeydown=function(){
    6.               if(event.keyCode==13){
    7.                 var value=this.value.trim();
    8.                 var reg=/^\d{6}$/;       //6位密码
    9.                 console.log(reg.test(value));
    10.               }
    11.           }
    12.     </script>

    用户密码验证

    1.  <input type="password"  id="input" >
    2. <script>
    3.         //用户密码验证
    4.           var input=document.getElementById("input");
    5.           input.onkeydown=function(){
    6.               if(event.keyCode==13){
    7.                 var value=this.value.trim();
    8.                 var reg=/^[A-z]\d{5,}$/;   //以字母开头，后面至少5位数字
    9.                 console.log(reg.test(value));
    10.               }
    11.           }
    12.  </script>

    电话号码

    1. <script>
    2.         var str="18674187236"
    3.         //严格匹配 ^以……开头 $以……结尾
    4.         var reg=/^1[3-9]\d{9}/;
    5.         console.log(reg.test(str))
    6.  </script>

    过滤标签

    1.  var str="<p>我是</p>。<div>你好</div>"
    2.  var reg=/<[^<>]+>/g; //
    3. console.log(str.replace(reg,""));//我是。你好