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<!doctype html><html lang="en"><head><meta charset="UTF-8"><meta name="viewport"content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0"><meta http-equiv="X-UA-Compatible" content="ie=edge"><title>Document</title></head><body><!--第一种禁用方法，给一个onsubmit事件禁用--><form action="login.php" method="post" id="login" onsubmit="return false"><label class="title">用户登录</label><label for="email">邮箱:</label><input type="email" id="email" name="email" value="" autofocus /><label for="password">密码:</label><input type="password" id="password" name="password" /><!-- 第二种禁用方法将button的submit值改为button --><button name="submit" type="button">登录</button></form><ul id="ul_id"><li>item1</li><li>item2</li><li>item3</li><li>item4</li><li>item5</li></ul><script>document.forms.login.submit.onclick = function (ev) {// 禁用默认提交行为ev.preventDefault();}ul_id.addEventListener("click",(e)=>{console.log(e.target) // 指向触发事件的元素console.log(e.currentTarget) // 绑定事件的元素})</script></body></html>
