StringBuilder &&StringBuffer删除最后一个字符的方法

CSS!important声明强制优先

是鸿彬呀: @layer firstLayer, secondLayer; p { /* 0-0-1 */ background-color: red; color: grey !important; border: 5px inset purple; } p#addSpecificity { /* 1-0-1 */ border-style: solid !important; } @layer firstLayer { #addSpecificity { /* 1-0-0 */ background-color: blue; color: white !important; border-width: 5px; border-style: dashed !important; } } @layer secondLayer { p#addSpecificity { /* 1-0-1 */ background-color: green; color: orange !important; border-width: 10px; border-style: dotted !important; } } <p > A paragraph with a border and background </p> 这里应用的是第一种样式，第二种权重高却没有应用，能讲解一下吗？