input.#{$prefix}-input-search + .button-search {
border-top-left-radius: 0;
border-bottom-left-radius: 0;
left: -0.3em;
}
input.#{$prefix}-input-search:focus + .button-search {
background: $border-focus-color;
}
input.#{$prefix}-input-search + .button-search里面的+是什么意思?
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选择相邻元素。。。