Example sharing of input legality verification method during js registration

This article mainly introduces in detail the input legality verification method during js registration. It has certain reference value. Interested friends can refer to it. I hope it can help everyone.

// 验证用户名,只允许 字母 数字 下划线 中文
//在input元素后面增加一个span元素，提示

function confirmName(){
  var name=document.getElementById("user_name");
  name.onblur=function(){
    if((name.value).length!=0){
      reg=/^[\u4e00-\u9fa5_a-zA-Z0-9-]{1,16}$/g;
      if(!reg.test(name.value)){
        alert("对不起，输入的用户名限16个字符，支持中英文、数字、减号或下划线 ");
      } 
    }
  };
}
function confirmEmail(){
  var email=document.getElementById("user_email");
  email.onblur=function(){
    if((email.value).length!=0){
      reg=/^([a-zA-Z0-9_-])+@([a-zA-Z0-9_-])+(.[a-zA-Z0-9_-])+/ ;
      if(!reg.test(email.value)){ 
        alert("对不起，您输入的邮箱格式不正确!");
      }
    }
  };
}
function confirmPassword(){
  var password=document.getElementById("user_password");
  password.onblur=function(){
    if((password.value).length!=0){
      reg=/^(\w){6,20}$/;
      if(!reg.test(password.value)){ 
        alert("对不起，您输入的密码格式不正确!");
      }
    }
  };
}
function confiemPasswordAgin(){
  var againpassword=document.getElementById("user_password_confirmation");

  var password=document.getElementById("user_password");
  againpassword.onblur=function(){
    // alert(againpassword.value);
      if(password.value.length!=againpassword.value.length){
      alert("密码输入不匹配,请重新输入");
      }
      if(password.value.indexOf(againpassword.value)==-1){
        alert("密码输入不匹配,请重新输入");
      }
    };
}
window.onload=function(){
  confirmName();
  confirmEmail();
  confirmPassword();
  confiemPasswordAgin();
};

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