event.preventDefault();不光可以用来阻止表单自动提交，也可以阻止链接！
阻止submit提交：
<form role="form" method="post">
<div class="form-group mb-3">
<div class="input-group input-group-merge input-group-alternative">
<input class="form-control" placeholder="邮箱" name="email" required="" type="email">
</div>
</div>
<div class="form-group">
<div class="input-group input-group-merge input-group-alternative">
<input class="form-control" placeholder="密码" name="password" required="" type="password">
</div>
</div>
<div class="text-center">
<button type="submit" class="btn btn-primary my-4 submit">登录</button>
</div>
</form>
$("submit").click(function(){
event.preventDefault();
});
| 参数 | 描述 |
|---|
| event | 必需。event 参数来自事件绑定函数。 |
