虽然这里提供的CSS解决方案有效，

对于任何喜欢使用Bootstrap 4方式的人，就像官方Bootstrap主题指南中建议的那样， 这应该会有帮助:

按你们的习惯。SCSS文件(参见上面的指南^)，其中您添加了您的变量覆盖，添加以下变量来删除按钮的盒子阴影:

// import bootstrap's variables & functions to override them
@import "node_modules/bootstrap/scss/functions";
@import "node_modules/bootstrap/scss/variables";
@import "node_modules/bootstrap/scss/mixins";

// override the variables you want (you can look them up in node_modules/bootstrap/scss/variables file, they're the ones that have the !default keyword at the end)
$btn-focus-box-shadow: none;

// option A: include all of Bootstrap (see the above guide for other options)
@import "node_modules/bootstrap/scss/bootstrap";

这对我很有用。

请注意，在bootstrap的变量文件中有许多变量用于box-shadow，也用于其他控件，所以如果你想使用它们和/或这个特定的变量不适合你，可能需要更多的研究。

如果以上方法对你不起作用，试试下面的方法:

.btn:焦点{轮廓:无;框影:无;边框:2px实体 透明;}

正如user1933897所指出的，这可能是针对MacOS和Chrome的。

I found the same situation using a submit button in a form using a bootstrap (v4.4.1) class. The problem arose as I was building a single-page user interface using JavaScript to manipulate all the required changes to the DOM. The form data was submitted to the server via 'fetch' using a JSON string rather than a HTTP POST request. Note that usually the form's default behaviour is to reload the document, and normally this would refresh the button, however the form's default behaviour was prevented by using e.preventDefault() in the listener function for the form's submit event (it is a single-page UI so the document is never reloaded and traffic to the server is minimised to data only). Given the document was not reloaded the button appeared to stay depressed until the user clicked elsewhere in the window. This is what I had (with the problem):

<输入类型=“submit”类=“btn btn-primary”>

这是我用来解决按钮一直按下的问题:

<input type=“submit” class=“btn btn-primary” onmouseup=“this.blur（）”>

你想要的是:

<button class="btn btn-primary btn-block" onclick="this.blur();">...

.blur()方法正确地删除了焦点高亮显示，并且不会弄乱bootstrap的样式。

对于sass用户，引导4应该通过重写变量来操作。

如果你想禁用按钮周围焦点上的框影:

$btn-focus-box-shadow: none;

你也可以禁用输入周围焦点上的框影:

$input-focus-box-shadow: none;

或者两者都有一个变量:

$input-btn-focus-box-shadow: none;

风格

.not-focusable:focus {
    outline: none;
    box-shadow: none;
}

使用

<button class="btn btn-primary not-focusable">My Button</button>