.invisible类可用于仅切换元素的可见性，这意味着它的显示不会被修改，并且元素仍然可以影响文档的流程。
句法：
<div class="invisible">...</div>如何使用它：
// Class
.invisible {
visibility: hidden;
}
// Usage as a mixin
.element {
@include invisible;
}bootstrap invisible内容
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