验证两次输入密码是否一致

第一种方法：在输入框后面加一个空白的span标签

DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Titletitle>
head>
<body>
<div align="center">
    <form id="commentForm" action="zhuce" method="post">
                <td>密码：td>
                <td>
                    <input type="text" id="password" required>
                td>
            tr>

            <tr>
                <td>重复密码：td>
                <td>
                    <input type="text" id="password1" required onblur="checkpassword()"><span id="tishi">span>
                td>
            tr>

            <td colspan="2"><div align="center">
                <input type="submit" value="注册">
            div>
            td>
            tr>
        table>
    form>
div>

body>
<script>
    function checkpassword() {
        var password = document.getElementById("password").value;
        var repassword = document.getElementById("password1").value;
        if(password!=repassword){
            document.getElementById("tishi").innerHTML = "两次密码不相同";
        }
    }
script>
html>

但是点击注册按钮还是会提交，所以说并没有什么用。并且我发现getElementById只会识别id属性，不会识别name属性。

第二种方法：

<script>
    function checkpassword() {
        var password = document.getElementById("password").value;
        var repassword = document.getElementById("password1").value;
        if(password!=repassword){
            alert("两次输入密码不一致！")
            document.getElementById('password').value = "";
            document.getElementById('password1').value = "";
        }
    }
script>